3-Methyl-2-butene-1-thiol: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide SVSC3 3-Methyl-2-butene-1-thiol prenylthiol, prenyl thiol, VSC3 pronounced: three-METH-il two-BYOO-teen one-THY-ol The number one skunk molecule. The main reason strong cannabis smells the way it does. Skunk & dieselFormula: C5H10SExtremely potent Aroma familySkunk FormulaC5H10S Mass102.20 g/mol Main noteSkunky 3-Methyl-2-butene-1-thiol · 102.20 g/mol The molecule Chemical structure This is the accurate skeletal structure of 3-Methyl-2-butene-1-thiol, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. SkunkyGassySulphurousPungent About What is 3-Methyl-2-butene-1-thiol? 3-Methyl-2-butene-1-thiol is the molecule most responsible for the strong, skunky smell people link with cannabis. It is often called prenylthiol. In 2021 a research team led by Iain Oswald pinpointed it as the number one skunk odorant in the plant. It carries a small chemical part called a prenyl group. This same building block turns up all over the cannabis plant, which may be why the smell feels so specific to cannabis. What the research says The Science Using a very sensitive method (two-dimensional gas chromatography with sulphur detection), the team measured this compound across many cultivars. The more of it a plant had, the more strongly people rated its skunky smell. It is powerful in tiny amounts. Even at a few parts per billion the nose picks it up easily, which is why a little goes a very long way. Aroma snapshot How 3-Methyl-2-butene-1-thiol Smells Skunk & diesel family SkunkyGassySulphurousPungent Smell strength: Extremely potent Detectable at just a few parts per billion. A tiny trace can fill a room. You might also smell it in: Skunk spray, and beer that has been left in the light (so-called “lightstruck” beer). Its role in the smell Part of the Whole On its own it smells purely skunky. Mixed with the fruity and piney terpenes, it helps give each cultivar its signature aroma. It sits alongside terpenes and cannabinoids as part of the plant’s full character. Good to know A Note on Safety 3-Methyl-2-butene-1-thiol is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions 3-Methyl-2-butene-1-thiol: Common Questions Is this what makes cannabis smell skunky? Yes. Research from 2021 found that 3-methyl-2-butene-1-thiol is the main molecule behind the classic skunky smell. The more a plant makes, the skunkier it tends to smell. Is it related to skunk spray or garlic? It belongs to the same broad family as the smelly molecules in skunk spray and garlic, called volatile sulphur compounds. That shared family is why all three can smell so strong. PreviousDimethyl trisulphide NextPrenyl thioacetate Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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Prenyl thioacetate: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide SPTA Prenyl thioacetate prenyl thioacetate, S-prenyl thioacetate pronounced: PREN-il thy-oh-ASS-uh-tate A close relative of the main skunk molecule, with a gassy, fuel-like twist. Skunk & dieselFormula: C7H12OSVery potent Aroma familySkunk FormulaC7H12OS Mass144.24 g/mol Main noteGassy S-(3-Methylbut-2-en-1-yl) ethanethioate · 144.24 g/mol The molecule Chemical structure This is the accurate skeletal structure of Prenyl thioacetate, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. GassySkunkySavourySulphurous About What is Prenyl thioacetate? Prenyl thioacetate is a close chemical cousin of the main skunk molecule. It carries the same prenyl building block, with a small acetate group added. It was described as part of the prenylated sulphur family found in cannabis. Its smell leans gassy and fuel-like. It is one of the compounds thought to sit behind the “diesel” or “gas” character that some cultivars are known for. What the research says The Science Like the other members of this family, it appears in very small amounts and needs sensitive sulphur-detecting equipment to measure. It tends to rise and fall alongside the main skunk molecule as the plant matures and is cured. Because it is so new to science, most of what is known is about its smell rather than any effect in the body. Aroma snapshot How Prenyl thioacetate Smells Skunk & diesel family GassySkunkySavourySulphurous Smell strength: Very potent Strong even in small amounts, with a gassy, fuel-like edge. You might also smell it in: The wider world of savoury, sulphur-rich smells shared with cooked garlic and onion. Its role in the smell Part of the Whole Adds a gassy, savoury layer on top of the pure skunk note. Blended with terpenes, it helps build the ‘gas’ profiles many people look for. Good to know A Note on Safety Prenyl thioacetate is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions Prenyl thioacetate: Common Questions What does ‘gassy’ or ‘diesel’ cannabis mean? Some cultivars smell a little like fuel or solvent. Sulphur compounds like prenyl thioacetate are part of where that gassy character comes from, working together with the plant’s terpenes. Is it the same as the main skunk molecule? No, but they are close relatives from the same family. This one has an extra acetate group, which nudges the smell towards gas and fuel. Previous3-Methyl-2-butene-1-thiol NextDiprenyl sulphide Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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Prenyl methyl sulphide: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide SPMS Prenyl methyl sulphide prenyl methyl sulphide, methyl prenyl sulphide pronounced: PREN-il METH-il SUL-fide A gentler prenyl sulphur compound with a savoury, umami feel. Garlic & savouryFormula: C6H12SModerately potent Aroma familyGarlic FormulaC6H12S Mass116.22 g/mol Main noteSavoury Methyl prenyl sulphide · 116.22 g/mol The molecule Chemical structure This is the accurate skeletal structure of Prenyl methyl sulphide, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. SavouryUmamiSulphurousMild garlic About What is Prenyl methyl sulphide? Prenyl methyl sulphide pairs the prenyl group with a small methyl group across a single sulphur atom. It is one of the softer members of the family. Rather than a sharp skunk or garlic hit, it adds a savoury, umami quality, a bit like the background depth in a slow-cooked stock. What the research says The Science Milder sulphur compounds like this one help round out a cultivar’s overall smell. They are easy to miss on their own but add richness to the whole. As with the rest of the family, the research so far is about aroma. Any effect in the body is unknown. Aroma snapshot How Prenyl methyl sulphide Smells Garlic & savoury family SavouryUmamiSulphurousMild garlic Smell strength: Moderately potent Softer than the others; savoury rather than sharp. You might also smell it in: Slow-cooked foods and broths, where gentle sulphur notes add background depth. Its role in the smell Part of the Whole Fills in the savoury middle of the aroma, giving body and depth beneath the brighter skunk and fruit notes. Good to know A Note on Safety Prenyl methyl sulphide is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions Prenyl methyl sulphide: Common Questions What does umami mean here? Umami is the savoury, moreish taste in foods like broth, mushrooms and parmesan. Prenyl methyl sulphide adds a smell with that same savoury depth. Is it as strong as the skunk molecule? No. It is one of the gentler compounds in the group, so it tends to sit in the background rather than take over. PreviousDiprenyl disulphide Next3-Mercaptohexan-1-ol Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Amagase, H. (2006) ‘Clarifying the real bioactive constituents of garlic’, Journal of Nutrition, 136(3), pp. 716S-725S. doi: 10.1093/jn/136.3.716S. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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Diprenyl sulphide: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide SDPS Diprenyl sulphide di-prenyl sulphide, bis(3-methylbut-2-enyl) sulphide pronounced: dy-PREN-il SUL-fide Two prenyl groups joined by sulphur. Smells closer to garlic than to skunk. Garlic & savouryFormula: C10H18SVery potent Aroma familyGarlic FormulaC10H18S Mass170.31 g/mol Main noteGarlic Diprenyl sulphide · 170.31 g/mol The molecule Chemical structure This is the accurate skeletal structure of Diprenyl sulphide, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. GarlicAlliaceousSavouryOniony About What is Diprenyl sulphide? Diprenyl sulphide is built from two prenyl groups joined by a single sulphur atom. That shape is very close to the smell molecules garlic makes, which use two allyl groups instead of prenyl. Its smell is more garlic and onion than skunk. It is one of the compounds that first made scientists notice how much cannabis and garlic have in common. What the research says The Science Garlic’s sulphur compounds have been studied for years for possible heart and blood-vessel benefits. Because cannabis makes such similar molecules, researchers have raised the hopeful question of whether cannabis sulphur compounds might one day show benefits of their own. This is an early idea, not a proven fact. So far the science here is about smell and structure, not about treating any condition. Aroma snapshot How Diprenyl sulphide Smells Garlic & savoury family GarlicAlliaceousSavouryOniony Smell strength: Very potent Rich and savoury; carries clearly even at low levels. You might also smell it in: Garlic, onions, leeks and chives, which build their smells in a very similar way. Its role in the smell Part of the Whole Brings a savoury, garlicky layer to a cultivar’s aroma. It is one of the compounds that ties the smell of cannabis to the smell of the kitchen. Good to know A Note on Safety Diprenyl sulphide is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions Diprenyl sulphide: Common Questions Why does some cannabis smell like garlic? Compounds like diprenyl sulphide are built much like the smell molecules in garlic and onions. When a plant makes more of them, it can take on a savoury, garlicky edge. Does that mean cannabis has garlic’s health benefits? Not proven. The molecules look alike, which is why researchers are hopeful, but no study has yet shown that cannabis sulphur compounds share garlic’s effects. PreviousPrenyl thioacetate NextDiprenyl disulphide Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Amagase, H. (2006) ‘Clarifying the real bioactive constituents of garlic’, Journal of Nutrition, 136(3), pp. 716S-725S. doi: 10.1093/jn/136.3.716S. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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Diprenyl disulphide: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide SDPDS Diprenyl disulphide di-prenyl disulphide pronounced: dy-PREN-il dy-SUL-fide Like diprenyl sulphide, but with two sulphur atoms. Deep, garlicky and long-lasting. Garlic & savouryFormula: C10H18S2Very potent Aroma familyGarlic FormulaC10H18S2 Mass202.38 g/mol Main noteGarlic Diprenyl disulphide · 202.38 g/mol The molecule Chemical structure This is the accurate skeletal structure of Diprenyl disulphide, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. GarlicOnionySavouryAlliaceous About What is Diprenyl disulphide? Diprenyl disulphide is like diprenyl sulphide but with two sulphur atoms joined together in the middle. That extra sulphur makes the smell deeper and longer-lasting. It is a near mirror of diallyl disulphide, one of the most studied smell molecules in garlic. The main difference is the prenyl group in place of garlic’s allyl group. What the research says The Science Diallyl disulphide from garlic has been looked at for possible effects on blood pressure and blood vessels. The close match with diprenyl disulphide is what makes the cannabis-and-garlic comparison so striking. It is important to be clear: looking alike is not the same as acting alike. This stays a hopeful research direction, not a health claim. Aroma snapshot How Diprenyl disulphide Smells Garlic & savoury family GarlicOnionySavouryAlliaceous Smell strength: Very potent Deep and long-lasting; the double sulphur bond makes it cling. You might also smell it in: Cooked garlic and onion, which are rich in these two-sulphur “disulphide” smells. Its role in the smell Part of the Whole Adds a deep, clingy, savoury base note to the aroma. Two-sulphur compounds like this one tend to linger longer than lighter smells. Good to know A Note on Safety Diprenyl disulphide is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions Diprenyl disulphide: Common Questions What is the garlic molecule it copies? Diallyl disulphide. Garlic’s version uses an allyl group; the cannabis version uses a prenyl group. Otherwise they are built the same way, with two sulphur atoms in the middle. Is this why some cannabis smells strongly of garlic? Two-sulphur compounds like this one are deep and clingy. When a plant makes more of them, its savoury, garlicky side becomes easier to notice. PreviousDiprenyl sulphide NextPrenyl methyl sulphide Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Amagase, H. (2006) ‘Clarifying the real bioactive constituents of garlic’, Journal of Nutrition, 136(3), pp. 716S-725S. doi: 10.1093/jn/136.3.716S. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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Dimethyl trisulphide: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide SDMTS Dimethyl trisulphide dimethyl trisulphide, DMTS pronounced: dy-METH-il try-SUL-fide Three sulphur atoms in a row. A savoury, oniony smell found in cooked foods. Everyday sulphurFormula: C2H6S3Very potent Aroma familyEveryday FormulaC2H6S3 Mass126.31 g/mol Main noteSavoury Dimethyl trisulphide · 126.31 g/mol The molecule Chemical structure This is the accurate skeletal structure of Dimethyl trisulphide, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. SavouryOnionCookedMeaty About What is Dimethyl trisulphide? Dimethyl trisulphide, or DMTS, has three sulphur atoms joined in a row. That gives it a strong, savoury, oniony smell. It is common in cooked foods, from fried onions to aged cheese. In cannabis it adds a savoury, cooked depth to the overall aroma. What the research says The Science Like DMS, DMTS is found widely in food, so its smell is well known. It is far more powerful than DMS thanks to those extra sulphur atoms. In cannabis it is one of several savoury sulphur notes that sit beneath the brighter skunk and fruit smells. Aroma snapshot How Dimethyl trisulphide Smells Everyday sulphur family SavouryOnionCookedMeaty Smell strength: Very potent Powerful and savoury; a little reads as onion or cooked meat. You might also smell it in: Cooked onion, aged cheese, cooked cabbage and some cooked meats. Its role in the smell Part of the Whole Deepens the savoury base of the aroma, adding a cooked, oniony richness under the sharper top-notes. Good to know A Note on Safety Dimethyl trisulphide is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions Dimethyl trisulphide: Common Questions Why does some cannabis smell savoury or oniony? Compounds like dimethyl trisulphide, also found in cooked onions and cheese, add a savoury, cooked depth. They sit under the sharper skunk and fruity smells. Is DMTS stronger than DMS? Yes. The extra sulphur atoms make dimethyl trisulphide much more powerful, which is why even a little smells strongly savoury. PreviousDimethyl sulphide Next3-Methyl-2-butene-1-thiol Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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Dimethyl sulphide: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide SDMS Dimethyl sulphide dimethyl sulphide, DMS pronounced: dy-METH-il SUL-fide A simple, everyday sulphur smell found across many foods. Everyday sulphurFormula: C2H6SModerately potent Aroma familyEveryday FormulaC2H6S Mass62.13 g/mol Main noteSweetish Dimethyl sulphide · 62.13 g/mol The molecule Chemical structure This is the accurate skeletal structure of Dimethyl sulphide, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. SweetishCooked vegetableCabbageMarine About What is Dimethyl sulphide? Dimethyl sulphide, or DMS, is one of the simplest sulphur smells there is: two methyl groups either side of a single sulphur atom. It is everywhere in food and nature. You have smelled it in cooked sweetcorn and cabbage, in beer, and even in the sea air at the coast. In cannabis it adds a light, savoury background note. What the research says The Science Unlike the prenyl compounds, DMS is not special to cannabis. It turns up across the plant and food world, which is why it is so well understood. In cannabis it is a minor player, adding a soft savoury edge rather than a defining smell. Aroma snapshot How Dimethyl sulphide Smells Everyday sulphur family SweetishCooked vegetableCabbageMarine Smell strength: Moderately potent Familiar from cooking; sweetish at low levels, cabbagey when strong. You might also smell it in: Cooked sweetcorn, cabbage, the sea breeze, beer and truffles. Its role in the smell Part of the Whole Sits quietly in the background, adding a gentle savoury lift rather than a smell of its own. Good to know A Note on Safety Dimethyl sulphide is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions Dimethyl sulphide: Common Questions Is dimethyl sulphide unique to cannabis? No. It is one of the most common sulphur smells in nature, found in cooked vegetables, the sea and many drinks. In cannabis it plays only a small background role. Is it harmful? It is a normal, widespread food aroma present in trace amounts. It is the smell, not a medicine, and there is no known concern at these tiny levels. Previous3-Mercaptohexyl acetate NextDimethyl trisulphide Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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3-Mercaptohexyl acetate: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide S3-MHA 3-Mercaptohexyl acetate 3-mercaptohexyl acetate, 3-sulfanylhexyl acetate, 3-MHA pronounced: three mer-KAP-toh-HEX-il ASS-uh-tate The passion-fruit molecule. The acetate cousin of 3-MH, even more tropical. Tropical & fruityFormula: C8H16O2SExtremely potent Aroma familyTropical FormulaC8H16O2S Mass176.28 g/mol Main notePassion fruit 3-Sulfanylhexyl acetate · 176.28 g/mol The molecule Chemical structure This is the accurate skeletal structure of 3-Mercaptohexyl acetate, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. Passion fruitTropicalFruityCitrus About What is 3-Mercaptohexyl acetate? 3-Mercaptohexyl acetate, or 3-MHA, is the acetate cousin of 3-MH. Adding the acetate group pushes the smell even further towards passion fruit and tropical punch. Like 3-MH, it is a star of flavour chemistry in wine and beer, and it was reported among the compounds behind fruity, exotic cannabis. What the research says The Science The 2023 study grouped 3-MHA with 3-MH as key drivers of tropical, fruity aromas in certain cultivars. The two often appear together. It is another extremely powerful smell, active at tiny concentrations. Aroma snapshot How 3-Mercaptohexyl acetate Smells Tropical & fruity family Passion fruitTropicalFruityCitrus Smell strength: Extremely potent An even punchier passion-fruit smell, powerful at trace levels. You might also smell it in: Passion fruit, tropical beers and white wines. Its role in the smell Part of the Whole Layers a ripe passion-fruit punch over the top of fruity cultivars, deepening their tropical character. Good to know A Note on Safety 3-Mercaptohexyl acetate is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions 3-Mercaptohexyl acetate: Common Questions What is the difference between 3-MH and 3-MHA? They are close cousins. 3-MHA has an extra acetate group, which shifts its smell from grapefruit towards passion fruit. They often occur together. Do these tropical smells mean the cannabis is stronger? No. Smell and strength are separate. A tropical aroma tells you about the plant’s sulphur compounds and terpenes, not about its cannabinoid content. Previous3-Mercaptohexan-1-ol NextDimethyl sulphide Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Oswald, I.W.H. et al. (2023) ‘Minor, nonterpenoid volatile compounds drive the aroma differences of exotic cannabis’, ACS Omega, 8(36), pp. 39203-39216. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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3-Mercaptohexan-1-ol: Aroma, Smell and Safety | PatientsCann UK Skip to main content Back to Sulphur Compounds Guide S3-MH 3-Mercaptohexan-1-ol 3-mercaptohexanol, 3-sulfanylhexan-1-ol, 3-MH pronounced: three mer-KAP-toh-HEX-an-ol The grapefruit molecule. A tropical, citrus thiol also famous in wine and beer. Tropical & fruityFormula: C6H14OSExtremely potent Aroma familyTropical FormulaC6H14OS Mass134.24 g/mol Main noteGrapefruit 3-Sulfanylhexan-1-ol · 134.24 g/mol The molecule Chemical structure This is the accurate skeletal structure of 3-Mercaptohexan-1-ol, drawn from PubChem data. Each corner and line-end is a carbon atom. The yellow S marks sulphur, the atom that gives this whole family its powerful smell. GrapefruitCitrusTropicalPassion fruit About What is 3-Mercaptohexan-1-ol? 3-Mercaptohexan-1-ol, or 3-MH, is a very different kind of sulphur compound. Instead of skunk or garlic, it smells of grapefruit, citrus and tropical fruit. It is well known outside cannabis. It is one of the molecules that give Sauvignon Blanc wine and certain hoppy beers their zesty, tropical lift. What the research says The Science A 2023 follow-up study reported that thiols like 3-MH help explain the fruity, tropical smell of some prized ‘exotic’ cannabis, a smell that terpenes alone could not account for. It is astonishingly powerful. The nose can detect it at parts per trillion, far below the level needed for most terpenes. Aroma snapshot How 3-Mercaptohexan-1-ol Smells Tropical & fruity family GrapefruitCitrusTropicalPassion fruit Smell strength: Extremely potent One of the most powerful smells known, detectable at parts per trillion. You might also smell it in: Sauvignon Blanc wine, tropical craft beers, grapefruit and passion fruit. Its role in the smell Part of the Whole Brings the bright, juicy, tropical top-notes to fruity cultivars, working hand in hand with citrus terpenes like limonene. Good to know A Note on Safety 3-Mercaptohexan-1-ol is an aroma compound, present in cannabis in trace amounts. It is not a medicine and has no dose of its own. What matters for you is the whole product and how it is prescribed. Always choose and adjust your medicine with your prescriber and pharmacist, never by smell alone. Questions 3-Mercaptohexan-1-ol: Common Questions Why does some cannabis smell of tropical fruit? Thiols such as 3-mercaptohexan-1-ol smell strongly of grapefruit and tropical fruit. A little goes a very long way, so even trace amounts can make a plant smell juicy and exotic. Is this the same molecule found in wine? Yes. 3-MH is one of the compounds that give Sauvignon Blanc wine and some tropical beers their grapefruit and passion fruit character. PreviousPrenyl methyl sulphide Next3-Mercaptohexyl acetate Back to full Sulphur Compounds Guide Important: This page is for education only. It is not medical advice. Research into cannabis sulphur compounds is very new, and most work so far is about smell, not treatment. The garlic comparison is about chemistry, not proven health effects. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Oswald, I.W.H., Ojeda, M.A., Pobanz, R.J., Koby, K.A., Buchanan, A.J., Del Rosso, J., Guzman, M.A. and Martin, T.J. (2021) ‘Identification of a new family of prenylated volatile sulfur compounds in cannabis revealed by comprehensive two-dimensional gas chromatography’, ACS Omega, 6(47), pp. 31667-31676. doi: 10.1021/acsomega.1c04196. Oswald, I.W.H. et al. (2023) ‘Minor, nonterpenoid volatile compounds drive the aroma differences of exotic cannabis’, ACS Omega, 8(36), pp. 39203-39216. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 3 August 2026).

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Sulphur Compounds in Cannabis: The Skunk Molecule Explained | PatientsCann UK Skip to the compound library PatientsCann UK  ·  Education Understanding Sulphur Compounds Cannabinoids and terpenes get all the attention. But a third group of molecules, the volatile sulphur compounds, is the real reason cannabis can smell so skunky, so gassy, or so surprisingly tropical. Here is what they are, and why they matter to patients. 9 compounds The skunk molecule explained Live chemical structures The garlic connection On this page What they are Aroma families The garlic link Freshness & curing Why tests miss them The full family Questions References What are sulphur compounds? Sulphur compounds, or volatile sulphur compounds, are a group of smelly molecules the cannabis plant makes in tiny amounts. Volatile just means they float easily into the air, which is why you smell them the moment you open a jar. They were only pinned down recently. In 2021 a team of scientists found a whole new family of them in cannabis, and showed that one, called 3-methyl-2-butene-1-thiol, is the main reason strong cannabis smells skunky. What makes them special is their power. Where terpenes are measured in whole percentages, these sulphur compounds work at a few parts per billion. A trace is all it takes to change how a whole plant smells. The third pillar of aroma Think of cannabis smell as a three-legged stool. Cannabinoids like THC and CBD do the medical work. Terpenes bring the citrus, pine and floral notes. Sulphur compounds add the skunk, the gas and the tropical punch. Together they give every cultivar its signature. Explore the other two in our cannabinoids and terpenes guides. Interactive The Three Aroma Families Cannabis sulphur compounds fall into a few groups by how they smell: pungent skunk and diesel, savoury garlic, bright tropical fruit, and the milder everyday smells found in food. Pick any compound below to see its family, its smell, and how powerful it is. The hopeful part The Garlic Connection Here is the exciting bit. Many of the sulphur compounds in cannabis are built almost exactly like the ones in garlic. The only real difference is a small chemical part: cannabis uses a “prenyl” group where garlic uses an “allyl” group. Cannabis Prenyl thiol the skunk molecule nearly the same shape Garlic Allyl thiol a garlic molecule Why it matters: Garlic’s sulphur compounds have been studied for years for possible benefits to the heart and blood vessels. Because cannabis makes such close copies, scientists have raised a hopeful question: might the cannabis versions one day show benefits of their own? Hopeful research, not proven Interactive Freshness: Why Timing Changes the Smell Sulphur compounds are delicate. They build up late in the plant’s life, peak at just the right moment, then fade away. This is why the same flower can smell powerful one week and flat the next. Tap each stage to follow the journey. What this means for you: if aroma matters to you, fresher is usually better. Keep cannabis in an airtight container, somewhere cool and dark, and it will hold its smell for longer. Illustration based on greenhouse monitoring by Oswald and colleagues (2021). The exact rise and fall differ from plant to plant. Good to know Why Your Lab Report Misses Them If sulphur compounds matter so much to smell, why are they almost never listed on a product’s lab report? The answer is that they are genuinely hard to catch. 1 They hide in tiny amounts Sulphur compounds appear at parts per billion, or even parts per trillion. That is thousands of times less than a typical terpene, so they are very easy to walk straight past. 2 Normal tests are not tuned for them The usual lab equipment is set up to measure cannabinoids and terpenes. It is not designed to spot faint sulphur smells, so it often does not report them at all. 3 It takes special kit The 2021 discovery needed a powerful method called two-dimensional gas chromatography with sulphur detection. Very few routine labs run it. The takeaway: a lab report (sometimes called a COA) tells you about cannabinoids and often terpenes, but rarely these sulphur compounds. If they are missing from the paperwork, it does not mean they are missing from the jar. Often, your own nose is the better guide. Full library The Sulphur Compound Family Select any card to open the full profile, with its accurate chemical structure, how it smells, what the research says, and where else you meet it in daily life. Use the filters to narrow the list by aroma family. Filter: All Skunk & diesel Garlic Tropical Everyday Questions Sulphur Compounds: Your Questions Answered What makes cannabis smell skunky? The main reason is a volatile sulphur compound called 3-methyl-2-butene-1-thiol, sometimes called prenylthiol. In 2021 scientists showed that the more of it a plant makes, the skunkier it smells. It is powerful even at a few parts per billion, so a trace goes a long way. Are sulphur compounds the same as terpenes? No. Terpenes give the citrus, pine and floral notes and are measured in whole percentages. Sulphur compounds contain a sulphur atom, work at far lower amounts, and add the skunk, gas and tropical smells that terpenes alone cannot explain. You can read about the aroma side in our terpenes guide. Why do cannabis sulphur compounds get compared to garlic? Cannabis makes sulphur compounds built much like the ones in garlic and onion. Garlic’s versions have been studied for possible heart and blood-vessel benefits, which is why researchers are hopeful about the cannabis ones. It is important to be clear that this is an early idea, not a proven health benefit. Does fresh cannabis smell stronger? Usually yes. Sulphur compounds rise in the last weeks of flowering and peak during curing, then fade once a jar is opened and over months of storage. Storing your cannabis airtight, cool and dark helps keep the aroma for longer. Why are sulphur compounds not on my

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Open Letter on Patient Access, Welfare and Moderation Transparency | PatientsCann UK® Skip to content Open letter Patient welfare Public statement Open letter: why free patient help is being blocked on r/ukmedicalcannabis PatientsCann UK CIC is a non-profit. Our help is free, and it always will be. Yet for around four years we have watched our free patient resources be filtered, removed and then banned on the r/ukmedicalcannabis subreddit. This is our open letter. It sets out what happened, the reasons we were given, our honest answer to each one, and where you can always find us. PatientsCann UK CIC Open letter 30 July 2026 Read our free resources On this page The core issue Timeline Our directors Reasons and our answer Why it harms patients Our commitment Find us References About this letter This is an open statement of our own experience, shared to inform patients and to invite fair dialogue. It is not legal advice. In the screenshots below, moderator names have been removed, and the only accounts shown are our own team’s. The screenshots also show our former name and website, The Sanskara Platform; we now operate as PatientsCann UK CIC. Who we are PatientsCann UK CIC is a registered Community Interest Company. A CIC is a non-profit set up to serve the community, not to make money for owners. We exist to give UK medical cannabis patients free, honest information, legal guidance and support. We take no payment from patients for any of it. We are writing this letter because free, non-profit patient resources, ours and those we are linked to, keep being filtered, removed and banned on one of the busiest patient forums in the country: the r/ukmedicalcannabis subreddit. We have asked, appealed, and offered to follow every rule. Time and again we have been met with silence. Why this matters Free, not for profit Every guide, legal framework and toolkit we make is free. We take no money from patients, ever. Removed and banned Our links and crossposts were filtered, our posts held for approval, and then we were permanently banned. Appeals ignored Our requests, formal appeals and offers to talk have gone unanswered for years. The core issue Gatekeeping essential patient information UK medical cannabis is new, complex, and changing fast. Patients lean on each other, and on trusted independent guidance, to stay safe and to stay legal. When the first forum a worried patient finds removes free, non-commercial education, patients are the ones who lose out. Over the past few years we have found that resources produced by, or linked to, PatientsCann UK have been filtered and removed from r/ukmedicalcannabis. This has even included content where we were not the only author, but were simply named as a contributor or a source. At the time we operated under our former name, The Sanskara Platform, and links to that free resource site, along with crossposts linked to our work, were blocked. The pattern we have seen: free help is treated as advertising, links are quietly filtered, appeals are ignored, and the door is closed with no clear right to reply. What we have experienced A documented timeline Around 4 years agoOur links removed, our crossposts blocked Links to our free resource site were being automatically removed, and crossposts from our patient committee subreddit were disabled. When we asked why, the moderators told us the material was being treated as advertising, because our website “appears to be built by and partnered with companies and consultancies in the medical cannabis sector.” Our answer at the time was simple: the site exists to give patients resources and education, and it makes no money from those links. Moderation reply confirming our links and crossposts were being automatically filtered as “advertising”, and our response explaining the resources are free. Around 4 years agoA patient resource taken down A post explaining how to verify a patient was removed under the “no advertising” rule. In the same message, the moderator accepted that the post “does contain a patient resource”, but removed it anyway. A free patient resource removed under the “no advertising” rule, even though the moderator accepted it was a genuine patient resource. Around 4 years agoPosting rights limited to approval only After a month-long ban was lifted, we were told we were not banned. In practice, every post and comment we made would be held back and would only appear if a moderator approved it first. Told we were “not banned”, but that every post and comment would have to wait for a moderator to approve it. Around 3 years agoWe tried again, in good faith We reached out again, calmly, hoping to reach “a mature conclusion” about the block on our resources. We explained that patients ask the same questions every day, questions our free guides already answer, and asked to talk it through so we could move forward together. Our good-faith request to reopen the conversation and find a fair way forward for the community. Around 3 years agoA permanent ban, and a question turned back on us We were then permanently banned from taking part in r/ukmedicalcannabis. When we asked for a clear reason, and suggested an independent review of the decision, the reply did not answer the point. Instead it turned the question back on us, saying that if anything needed investigating, it was our “backing and investors.” The permanent ban notice, and the exchange that followed when we asked for reasons and an independent review. This year, MarchA fresh request for review, met with silence Most recently, in March, we sent a calm, respectful request to revisit the ban. We explained that we were never given a clear or definitive reason, and that we simply wanted the chance to put it right. As with our earlier appeals, we received no meaningful reply. Our most recent request for review, sent in good faith and, once again, left unanswered. Not one account This reached others. The messages above are from our Managing Director. But

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THCA: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide THCA THCA THCA, THC-acid, 2-COOH-THC pronounced: tet-ruh-hy-droh-kuh-nab-ih-NOL-ik AS-id The raw, unheated form of THC. Not intoxicating until it is heated. Acidic (raw) cannabinoidFormula: C22H30O4Intoxicating: No TypeAcidic (raw) FormulaC22H30O4 IntoxicatingNo Key focusInflammation Tetrahydrocannabinolic acid · 358.5 g/mol The molecule Chemical structure This is the accurate skeletal structure of THCA, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C22H30O4 and it weighs 358.5 g/mol. Anti-inflammatoryAnti-sicknessNeuroprotectiveRaw / unheated About What is THCA? Tetrahydrocannabinolic acid, or THCA, is the raw form of THC found in fresh, living and undried cannabis. Here is the surprising part: THCA is not intoxicating. Eating raw cannabis flower will not get you high. THCA carries an extra acid group that THC does not have. That group is the reason the two behave so differently. In the body How THCA Works The acid group on THCA stops it from fitting the CB1 receptor well, so it does not cause a high. Instead, research suggests THCA acts on other targets, including PPAR-gamma receptors, and shows anti-inflammatory activity a little like some common painkillers. Early studies, mostly in the lab and in animals, have looked at THCA for inflammation, nausea, and protecting nerve cells. Some patients use raw cannabis, for example in juices, to get THCA without the high. Receptor snapshot Where THCA Acts The endocannabinoid system has two main receptors. Here is how strongly THCA acts on each. CB1Brain & nervous systemNone Its bulky acid group stops it fitting CB1 well. This is why raw, unheated cannabis does not make you high. CB2Immune system & bodyWeak / indirect Weak action at CB2. Beyond CB1 and CB2: Acts on PPAR-gamma and has COX / anti-inflammatory activity. In the plant How THCA is Made THCA is made from the mother acid CBGA by an enzyme called THCA synthase. It is the main cannabinoid in most dried high-THC flower, before it is heated. When you vape, smoke or cook the flower, heat removes a carbon dioxide group and turns THCA into THC. This is the single most important step in making cannabis intoxicating. PathwayTHCAadd heat →Delta-9-THC Good to know Safety and Side Effects THCA in its raw form is not intoxicating and appears well tolerated. The main practical point is that heat, even gentle warmth over time, converts it into intoxicating THC, so a “raw” product can change if it is warmed or stored badly. Human safety data is limited. Speak to your prescriber before using raw or high-THCA products. Questions THCA: Common Questions Why does raw cannabis not get you high? Because fresh cannabis contains THCA, not THC. THCA carries an extra acid group that stops it fitting the CB1 receptor. Only when you heat it (smoking, vaping or cooking) does it lose that group and become intoxicating THC. Is THCA the same as THC? No, but they are closely related. THCA is the raw, acidic form. Heat removes a carbon dioxide molecule and turns THCA into THC – a process called decarboxylation. PreviousCBDV NextCBDA Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nadal, X. et al. (2017) ‘Tetrahydrocannabinolic acid is a potent PPAR-gamma agonist with neuroprotective activity’, British Journal of Pharmacology, 174(23), pp. 4263-4276. doi: 10.1111/bph.14019. Moreno-Sanz, G. (2016) ‘Can you pass the acid test? Critical review and novel therapeutic perspectives of delta-9-tetrahydrocannabinolic acid A’, Cannabis and Cannabinoid Research, 1(1), pp. 124-130. doi: 10.1089/can.2016.0008. Izzo, A.A., Borrelli, F., Capasso, R., Di Marzo, V. and Mechoulam, R. (2009) ‘Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb’, Trends in Pharmacological Sciences, 30(10), pp. 515-527. doi: 10.1016/j.tips.2009.07.006. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026).

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THCV: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide THCV THCV THCV, tetrahydrocannabivarin pronounced: tet-ruh-hy-droh-kuh-NAB-ih-vair-in THC’s slimmer cousin – it can dial the CB1 receptor down or up depending on the dose. Neutral cannabinoidFormula: C19H26O2Intoxicating: Dose-based TypeNeutral FormulaC19H26O2 IntoxicatingDose-based Key focusAppetite Tetrahydrocannabivarin · 286.4 g/mol The molecule Chemical structure This is the accurate skeletal structure of THCV, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C19H26O2 and it weighs 286.4 g/mol. Appetite controlFocusBlood-sugarEnergy About What is THCV? Tetrahydrocannabivarin, or THCV, is a slimmer cousin of THC. It has a shorter carbon “tail”, three carbons instead of five, and that small change gives it some surprising behaviour. THCV is found in higher amounts in certain plants, particularly some varieties from Africa and Asia. At the low doses usually found in products, it is not intoxicating. In the body How THCV Works THCV is unusual because its effect flips with dose. At low doses it blocks the CB1 receptor, the opposite of what THC does, which is why it is being studied to curb appetite. At high doses it can switch CB1 on instead, more like THC. It also acts as a partial activator of CB2. This double action has made THCV interesting for weight management, and for blood-sugar control in type 2 diabetes, where early trials look promising but are still small. Receptor snapshot Where THCV Acts The endocannabinoid system has two main receptors. Here is how strongly THCV acts on each. CB1Brain & nervous systemDampens / blocks At low doses it BLOCKS CB1 – the opposite of THC – which may curb appetite. At high doses it can switch CB1 on instead. CB2Immune system & bodyPartial Acts as a partial activator of CB2. In the plant How THCV is Made THCV comes from its acid, THCVA, which sits on a separate “propyl” branch of the family tree. This branch starts from CBGVA, the shorter-tailed version of the mother acid CBGA. As with the others, heat turns THCVA into THCV. Comes fromTHCVA→ add heat →THCV Good to know Safety and Side Effects THCV appears well tolerated in early studies, with few side effects at the doses tested. Because it can behave like THC at high doses, very strong products could in theory be intoxicating. Research in people is still limited, so speak to your prescriber before using THCV, especially if you manage diabetes or take medicines that affect appetite or blood sugar. Questions THCV: Common Questions Is THCV an appetite suppressant? At low doses THCV blocks the CB1 receptor, the opposite of THC, which is why it is being studied for appetite control and weight management. At high doses this can flip and it may activate CB1 instead. What makes THCV different from THC? THCV has a shorter carbon “tail” (three carbons instead of five). This small change flips how it behaves at the CB1 receptor at low doses. PreviousCBC NextCBDV Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Pertwee, R.G. (2008) ‘The diverse CB1 and CB2 receptor pharmacology of three plant cannabinoids: delta-9-tetrahydrocannabinol, cannabidiol and delta-9-tetrahydrocannabivarin’, British Journal of Pharmacology, 153(2), pp. 199-215. doi: 10.1038/sj.bjp.0707442. Izzo, A.A., Borrelli, F., Capasso, R., Di Marzo, V. and Mechoulam, R. (2009) ‘Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb’, Trends in Pharmacological Sciences, 30(10), pp. 515-527. doi: 10.1016/j.tips.2009.07.006. Morales, P., Hurst, D.P. and Reggio, P.H. (2017) ‘Molecular targets of the phytocannabinoids: a complex picture’, Progress in the Chemistry of Organic Natural Products, 103, pp. 103-131. doi: 10.1007/978-3-319-45541-9_4. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026).

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Delta-8-THC: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide 8-THC Delta-8-THC delta-8-THC, delta eight pronounced: DEL-tuh ate tet-ruh-hy-droh-kuh-NAB-ih-nol A close cousin of THC with the double bond in a different place – usually milder. Neutral cannabinoidFormula: C21H30O2Intoxicating: Yes TypeNeutral FormulaC21H30O2 IntoxicatingYes Key focusMilder high Delta-8-tetrahydrocannabinol · 314.5 g/mol The molecule Chemical structure This is the accurate skeletal structure of Delta-8-THC, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C21H30O2 and it weighs 314.5 g/mol. Milder highAnti-sicknessPain reliefAppetite About What is Delta-8-THC? Delta-8-THC is a close relative of ordinary delta-9-THC. The two molecules are almost identical; the only difference is where one double bond sits in the ring. That tiny change is enough to make delta-8 behave a little differently. It occurs naturally in cannabis only in very small amounts. Most delta-8 sold abroad is made in a lab from CBD, which is a very different thing from a plant extract. In the body How 8-THC Works Delta-8 switches on the same CB1 receptor as delta-9-THC, so it is intoxicating, but it holds on a little less tightly. Many people describe its effects as milder and clearer-headed, with less anxiety, though this varies from person to person. It is also more chemically stable than delta-9-THC, meaning it breaks down more slowly. Research on delta-8 in people is limited compared with delta-9-THC. Receptor snapshot Where 8-THC Acts The endocannabinoid system has two main receptors. Here is how strongly Delta-8-THC acts on each. CB1Brain & nervous systemPartial Switches on CB1 like Delta-9-THC, but holds on a little less tightly, so the effects are usually milder. CB2Immune system & bodyPartial Also binds CB2. In the plant How 8-THC is Made In the plant, only a trace of delta-8 forms, partly as delta-9-THC slowly degrades. Because there is so little of it naturally, commercial delta-8 is usually made in a lab by converting CBD. This is why product quality and purity matter so much. Comes fromDelta-9-THC→ add heat →Delta-8-THC Good to know Safety and Side Effects Delta-8 can cause the same kinds of effects as THC, including a fast heartbeat, dry mouth and drowsiness, and it affects driving. A bigger concern is quality: lab-made delta-8 products, especially unregulated ones, can contain leftover chemicals and unknown by-products. In the UK, delta-8-THC is a controlled substance, the same as delta-9-THC. Only use cannabinoids from a regulated, prescribed source. Questions Delta-8-THC: Common Questions Is delta-8-THC the same as normal THC? Almost. Delta-8 and delta-9-THC differ only by where one double bond sits in the ring. That small change makes delta-8 bind the CB1 receptor a little less tightly, so its effects are usually milder. Is delta-8-THC legal in the UK? Delta-8-THC is a controlled substance in the UK, the same as delta-9-THC. Much of what is sold abroad as “delta-8” is made in a lab, not from the plant. PreviousCBN NextCBC Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Kruger, D.J. and Kruger, J.S. (2022) ‘Consumer experiences with delta-8-THC: medical use, pharmaceutical substitution, and comparisons with delta-9-THC’, Cannabis and Cannabinoid Research, 7(6), pp. 866-876. doi: 10.1089/can.2021.0124. ElSohly, M.A. and Gul, W. (2014) ‘Constituents of Cannabis sativa’, in Pertwee, R. (ed.) Handbook of Cannabis. Oxford: Oxford University Press, pp. 3-22. Pertwee, R.G. (2008) ‘The diverse CB1 and CB2 receptor pharmacology of three plant cannabinoids: delta-9-tetrahydrocannabinol, cannabidiol and delta-9-tetrahydrocannabivarin’, British Journal of Pharmacology, 153(2), pp. 199-215. doi: 10.1038/sj.bjp.0707442. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026).

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CBGA: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide CBGA CBGA CBGA, “the mother acid” pronounced: kan-uh-bih-jer-OL-ik AS-id The true “mother” – the acid the plant turns into every other cannabinoid. Acidic (raw) cannabinoidFormula: C22H32O4Intoxicating: No TypeAcidic (raw) FormulaC22H32O4 IntoxicatingNo Key focusPrecursor Cannabigerolic acid · 360.5 g/mol The molecule Chemical structure This is the accurate skeletal structure of CBGA, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C22H32O4 and it weighs 360.5 g/mol. PrecursorMetabolicAnti-inflammatoryRaw / unheated About What is CBGA? Cannabigerolic acid, or CBGA, is where the whole cannabinoid story begins. It is the very first cannabinoid the cannabis plant makes, and it is often called the “mother cannabinoid” because everything else is built from it. On its own, CBGA is not intoxicating. It is a raw acid, and most of it is quickly turned into other cannabinoid acids as the plant grows. In the body How CBGA Works CBGA does not act strongly on the CB1 or CB2 receptors directly. Its main role is as a building block. Inside the plant, three different enzymes take CBGA and turn it into THCA, CBDA or CBCA, which then become THC, CBD and CBC when heated. Because it is a starting material rather than a finished product, CBGA has been studied less as a medicine, though early research is beginning to look at it for metabolism and inflammation. Receptor snapshot Where CBGA Acts The endocannabinoid system has two main receptors. Here is how strongly CBGA acts on each. CB1Brain & nervous systemNone Does not act on CB1 directly. CB2Immune system & bodyNone Does not act on CB2 directly. Beyond CB1 and CB2: The starting molecule. The plant’s enzymes turn CBGA into THCA, CBDA and CBCA. Early research looks at PPAR receptors and metabolism. In the plant How CBGA is Made CBGA is built when the plant joins a molecule called olivetolic acid with a terpene building block, geranyl pyrophosphate, using an enzyme called CBGA synthase. From there, CBGA is the crossroads of the whole family. If it is simply heated, it becomes CBG. If the plant’s enzymes act on it first, it becomes the acids that lead to THC, CBD and CBC. PathwayCBGAadd heat →CBG Good to know Safety and Side Effects There is very little human safety data on CBGA, because it is usually converted into other cannabinoids rather than used on its own. It is not intoxicating. Treat any CBGA product as experimental and speak to your prescriber before trying it. Questions CBGA: Common Questions What is CBGA? CBGA (cannabigerolic acid) is the first cannabinoid the cannabis plant makes. It is often called the “mother cannabinoid” because the plant’s enzymes turn it into the acids that become THC, CBD and CBC. Does CBGA turn into CBG? Yes. When CBGA is heated it loses its acid group (a process called decarboxylation) and becomes CBG. PreviousCBDA NextDelta-9-THC Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nachnani, R., Raup-Konsavage, W.M. and Vrana, K.E. (2021) ‘The pharmacological case for cannabigerol’, Journal of Pharmacology and Experimental Therapeutics, 376(2), pp. 204-212. doi: 10.1124/jpet.120.000340. Morales, P., Hurst, D.P. and Reggio, P.H. (2017) ‘Molecular targets of the phytocannabinoids: a complex picture’, Progress in the Chemistry of Organic Natural Products, 103, pp. 103-131. doi: 10.1007/978-3-319-45541-9_4. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026). Izzo, A.A., Borrelli, F., Capasso, R., Di Marzo, V. and Mechoulam, R. (2009) ‘Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb’, Trends in Pharmacological Sciences, 30(10), pp. 515-527. doi: 10.1016/j.tips.2009.07.006.

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CBDV: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide CBDV CBDV CBDV, cannabidivarin pronounced: kan-uh-bih-dih-VAIR-in CBD’s slimmer cousin – non-intoxicating and studied for seizures. Neutral cannabinoidFormula: C19H26O2Intoxicating: No TypeNeutral FormulaC19H26O2 IntoxicatingNo Key focusSeizures Cannabidivarin · 286.4 g/mol The molecule Chemical structure This is the accurate skeletal structure of CBDV, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C19H26O2 and it weighs 286.4 g/mol. Anti-seizureCalmingAnti-sicknessAnti-inflammatory About What is CBDV? Cannabidivarin, or CBDV, is the slimmer cousin of CBD, with a shorter carbon tail. Like CBD, it does not make you high. It is usually a minor part of the plant, though some varieties, especially certain landrace plants from Asia, contain more of it. In the body How CBDV Works CBDV has very little direct action at the CB1 and CB2 receptors. Instead it works mainly through the body’s TRP channels, which are involved in pain, inflammation and the control of nerve excitability. Its most studied use is as an anticonvulsant. Animal research has shown it can reduce seizures, and it has also been explored for behaviours linked with autism. Human research is still at an early stage. Receptor snapshot Where CBDV Acts The endocannabinoid system has two main receptors. Here is how strongly CBDV acts on each. CB1Brain & nervous systemNone Very little direct action at CB1, so no high. CB2Immune system & bodyWeak / indirect Weak action at CB2. Beyond CB1 and CB2: Acts on TRP channels. Being studied for epilepsy and for behaviours linked with autism. In the plant How CBDV is Made CBDV is made from its acid, CBDVA, on the same “propyl” branch of the family tree as THCV, starting from the shorter-tailed mother acid CBGVA. Heat turns CBDVA into CBDV. Comes fromCBDVA→ add heat →CBDV Good to know Safety and Side Effects CBDV has been well tolerated in the clinical trials done so far, with mild side effects such as stomach upset. As an experimental compound, its long-term safety is still being studied. It is not a licensed medicine on its own, so only use it under the guidance of a prescriber. Questions CBDV: Common Questions What is CBDV used for? CBDV is being researched mainly as an anticonvulsant, for epilepsy, and for behaviours associated with autism. It is still experimental and not a licensed medicine on its own. Does CBDV get you high? No. Like CBD, CBDV is non-intoxicating and does not activate the CB1 receptor. PreviousTHCV NextTHCA Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Hill, A.J. et al. (2012) ‘Cannabidivarin is anticonvulsant in mouse and rat’, British Journal of Pharmacology, 167(8), pp. 1629-1642. doi: 10.1111/j.1476-5381.2012.02207.x. Izzo, A.A., Borrelli, F., Capasso, R., Di Marzo, V. and Mechoulam, R. (2009) ‘Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb’, Trends in Pharmacological Sciences, 30(10), pp. 515-527. doi: 10.1016/j.tips.2009.07.006. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026). Morales, P., Hurst, D.P. and Reggio, P.H. (2017) ‘Molecular targets of the phytocannabinoids: a complex picture’, Progress in the Chemistry of Organic Natural Products, 103, pp. 103-131. doi: 10.1007/978-3-319-45541-9_4.

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CBDA: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide CBDA CBDA CBDA, CBD-acid pronounced: kan-uh-bih-dy-OL-ik AS-id The raw, unheated form of CBD. Studied for nausea and inflammation. Acidic (raw) cannabinoidFormula: C22H30O4Intoxicating: No TypeAcidic (raw) FormulaC22H30O4 IntoxicatingNo Key focusNausea Cannabidiolic acid · 358.5 g/mol The molecule Chemical structure This is the accurate skeletal structure of CBDA, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C22H30O4 and it weighs 358.5 g/mol. Anti-sicknessAnti-inflammatoryCalmingRaw / unheated About What is CBDA? Cannabidiolic acid, or CBDA, is the raw form of CBD found in the fresh plant. Like CBD, it does not make you high. It was one of the first cannabinoids ever isolated, back in the 1950s. CBDA carries an extra acid group compared with CBD, which changes how it behaves in the body. In the body How CBDA Works CBDA has a couple of interesting actions. It blocks an enzyme called COX-2, which is the same target as some anti-inflammatory painkillers, and it strongly activates the serotonin 5-HT1A receptor, which is closely involved in feeling sick. Because of this, the strongest early research on CBDA is for nausea and vomiting, where animal studies suggest it may be even more powerful than CBD itself. It is also being explored for inflammation and anxiety. Receptor snapshot Where CBDA Acts The endocannabinoid system has two main receptors. Here is how strongly CBDA acts on each. CB1Brain & nervous systemNone Does not fit CB1, so no high. CB2Immune system & bodyNone Little action at CB2. Beyond CB1 and CB2: Blocks COX-2 (like some anti-inflammatory medicines) and acts strongly on 5-HT1A serotonin receptors, which are linked to nausea. In the plant How CBDA is Made CBDA is made from the mother acid CBGA by an enzyme called CBDA synthase. It is the main cannabinoid in fresh CBD-rich plants before heating. Heat removes a carbon dioxide group and turns CBDA into CBD. This happens slowly even at room temperature, which is why fresh plants are richer in the acid. PathwayCBDAadd heat →CBD Good to know Safety and Side Effects CBDA appears well tolerated in the limited research available. As it is not intoxicating, it does not carry the “high”-related risks of THC. Its long-term safety in people is not yet well established. CBDA is less stable than CBD and slowly turns into it with heat and time. Tell your prescriber before using a raw or high-CBDA product. Questions CBDA: Common Questions What is CBDA good for? Early research suggests CBDA may help with nausea and inflammation, partly by acting on serotonin (5-HT1A) receptors. It is still experimental and not a licensed medicine. How is CBDA different from CBD? CBDA is the raw, acidic form found in the living plant. Heat removes its acid group and turns it into CBD, the form most people are familiar with. PreviousTHCA NextCBGA Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Bolognini, D. et al. (2013) ‘Cannabidiolic acid prevents vomiting in Suncus murinus and nausea-induced behaviour in rats by enhancing 5-HT1A receptor activation’, British Journal of Pharmacology, 168(6), pp. 1456-1470. doi: 10.1111/bph.12043. Izzo, A.A., Borrelli, F., Capasso, R., Di Marzo, V. and Mechoulam, R. (2009) ‘Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb’, Trends in Pharmacological Sciences, 30(10), pp. 515-527. doi: 10.1016/j.tips.2009.07.006. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026). Morales, P., Hurst, D.P. and Reggio, P.H. (2017) ‘Molecular targets of the phytocannabinoids: a complex picture’, Progress in the Chemistry of Organic Natural Products, 103, pp. 103-131. doi: 10.1007/978-3-319-45541-9_4.

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CBC: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide CBC CBC cannabichromene pronounced: kan-uh-bih-KROH-meen A quiet, non-intoxicating cannabinoid studied for pain and mood. Neutral cannabinoidFormula: C21H30O2Intoxicating: No TypeNeutral FormulaC21H30O2 IntoxicatingNo Key focusPain & mood Cannabichromene · 314.5 g/mol The molecule Chemical structure This is the accurate skeletal structure of CBC, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C21H30O2 and it weighs 314.5 g/mol. Pain reliefMoodAnti-inflammatoryAnti-bacterial About What is CBC? Cannabichromene, or CBC, is one of the four most common cannabinoids in cannabis, alongside THC, CBD and CBG, yet most people have never heard of it. It does not make you high. Like the others, CBC starts as an acid, CBCA, made from the mother cannabinoid CBGA, and it appears once the plant is heated. In the body How CBC Works CBC barely touches the CB1 receptor, which is why it is not intoxicating. It does switch on the CB2 receptor, and it strongly activates the body’s TRP channels, which sense pain and heat. This may be how it helps with discomfort. Laboratory research has looked at CBC for pain, mood and inflammation, and even at how it might support brain cells. Like many minor cannabinoids, it is thought to work best as part of a team, the “entourage effect”, rather than alone. Receptor snapshot Where CBC Acts The endocannabinoid system has two main receptors. Here is how strongly CBC acts on each. CB1Brain & nervous systemNone Barely touches CB1, so it is not intoxicating. CB2Immune system & bodyPartial Does activate CB2, which is linked to inflammation. Beyond CB1 and CB2: Strongly activates TRPA1 and TRPV pain and heat-sensing channels, which may be how it helps with pain. In the plant How CBC is Made CBC is made from CBCA, which the plant produces from CBGA using an enzyme called CBCA synthase. Heating turns CBCA into CBC. Over time, and with strong light, CBC can slowly change again into another cannabinoid called CBL. Comes fromCBCA→ add heat →CBC Good to know Safety and Side Effects CBC appears to be well tolerated, with little sign of serious side effects in the limited research so far. Because human studies are scarce, its long-term safety is not fully known. As always, tell your prescriber before adding a new cannabinoid to your routine. Questions CBC: Common Questions Is CBC intoxicating? No. CBC hardly binds the CB1 receptor, so it will not make you high. It is being studied for pain, mood and inflammation. What does CBC do? CBC seems to work mainly through the body’s TRP pain and heat channels, and by activating CB2 receptors. Researchers think it works best together with THC and CBD, as part of the “entourage effect”. PreviousDelta-8-THC NextTHCV Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References DeLong, G.T., Wolf, C.E., Poklis, A. and Lichtman, A.H. (2010) ‘Pharmacological evaluation of the natural constituent of Cannabis sativa, cannabichromene and its modulation by delta-9-tetrahydrocannabinol’, Drug and Alcohol Dependence, 112(1-2), pp. 126-133. doi: 10.1016/j.drugalcdep.2010.05.019. Izzo, A.A., Borrelli, F., Capasso, R., Di Marzo, V. and Mechoulam, R. (2009) ‘Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb’, Trends in Pharmacological Sciences, 30(10), pp. 515-527. doi: 10.1016/j.tips.2009.07.006. Morales, P., Hurst, D.P. and Reggio, P.H. (2017) ‘Molecular targets of the phytocannabinoids: a complex picture’, Progress in the Chemistry of Organic Natural Products, 103, pp. 103-131. doi: 10.1007/978-3-319-45541-9_4. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026).

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CBG: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide CBG CBG cannabigerol, “the mother cannabinoid” pronounced: kan-uh-bih-JER-ol The “mother cannabinoid” – the plant makes everything else from its acid form. Neutral cannabinoidFormula: C21H32O2Intoxicating: No TypeNeutral FormulaC21H32O2 IntoxicatingNo Key focusFocus & gut Cannabigerol · 316.5 g/mol The molecule Chemical structure This is the accurate skeletal structure of CBG, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C21H32O2 and it weighs 316.5 g/mol. FocusAnti-bacterialGut supportAnti-inflammatory About What is CBG? Cannabigerol, or CBG, is often called the “mother cannabinoid”. That is because its acid form, CBGA, is the raw material the plant uses to build almost every other cannabinoid. Most plants turn nearly all of their CBGA into other things, so mature flower usually contains only a little CBG. To get more CBG, growers harvest some plants early, or breed special CBG-rich varieties. Like CBD, CBG does not make you high. In the body How CBG Works CBG binds both the CB1 and CB2 receptors, but only weakly, which is why it is not intoxicating. It also acts on other targets, including alpha-2 adrenoceptors, which are involved in alertness, and serotonin receptors. Early research, still mostly in the lab and in animals, is looking at CBG for inflammatory bowel disease, for protecting nerve cells, for mood, and as an antibacterial. Human studies are still limited, so its benefits are not yet proven. Receptor snapshot Where CBG Acts The endocannabinoid system has two main receptors. Here is how strongly CBG acts on each. CB1Brain & nervous systemPartial Binds CB1 weakly, so it is not intoxicating. CB2Immune system & bodyPartial Binds CB2 weakly too. Beyond CB1 and CB2: Also acts on alpha-2 adrenoceptors and blocks 5-HT1A serotonin receptors. In the plant How CBG is Made CBG comes from CBGA, the first cannabinoid acid the plant makes, by joining a molecule called olivetolic acid with a terpene building block. Any CBGA the plant does not turn into THCA, CBDA or CBCA can be heated to become CBG. This is why CBG sits at the very start of the cannabinoid family tree. Comes fromCBGA→ add heat →CBG Good to know Safety and Side Effects CBG appears to be well tolerated in the small amount of research done so far, with few reported side effects. Because studies in people are limited, its long-term safety is not fully known. As with any cannabinoid, tell your prescriber before adding CBG, especially if you take other medicines. Questions CBG: Common Questions Why is CBG called the mother cannabinoid? Because its acid form, CBGA, is the raw material the cannabis plant uses to build the other cannabinoids. Enzymes turn CBGA into THCA, CBDA and CBCA, which then become THC, CBD and CBC. Is CBG intoxicating? No. CBG binds the CB1 receptor only weakly, so it does not cause a high. PreviousCBD NextCBN Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nachnani, R., Raup-Konsavage, W.M. and Vrana, K.E. (2021) ‘The pharmacological case for cannabigerol’, Journal of Pharmacology and Experimental Therapeutics, 376(2), pp. 204-212. doi: 10.1124/jpet.120.000340. Izzo, A.A., Borrelli, F., Capasso, R., Di Marzo, V. and Mechoulam, R. (2009) ‘Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb’, Trends in Pharmacological Sciences, 30(10), pp. 515-527. doi: 10.1016/j.tips.2009.07.006. Morales, P., Hurst, D.P. and Reggio, P.H. (2017) ‘Molecular targets of the phytocannabinoids: a complex picture’, Progress in the Chemistry of Organic Natural Products, 103, pp. 103-131. doi: 10.1007/978-3-319-45541-9_4. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026).

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CBN: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide CBN CBN cannabinol pronounced: kan-uh-bih-NOL The ageing cannabinoid – forms as THC gets old, often linked with sleep. Neutral cannabinoidFormula: C21H26O2Intoxicating: Mild TypeNeutral FormulaC21H26O2 IntoxicatingMild Key focusSleep Cannabinol · 310.4 g/mol The molecule Chemical structure This is the accurate skeletal structure of CBN, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C21H26O2 and it weighs 310.4 g/mol. SleepMildly relaxingPain reliefAnti-inflammatory About What is CBN? Cannabinol, or CBN, is the cannabinoid of old cannabis. The plant does not really set out to make it. Instead, it forms slowly when THC is left exposed to air, heat and light. Older, or poorly stored, cannabis tends to have more CBN. CBN is only very mildly intoxicating, far weaker than THC. It is best known for its reputation as a sleep aid, although the science behind that is thinner than the marketing suggests. In the body How CBN Works CBN is a weak activator of the CB1 receptor, roughly one-tenth as strong as THC, which is why it barely makes you high. It binds the CB2 receptor a little more strongly, linking it to the immune system. Its popular link with sleep may come partly from the other sedating compounds found in aged cannabis, rather than from CBN alone. Good-quality human studies on CBN for sleep are still needed. Receptor snapshot Where CBN Acts The endocannabinoid system has two main receptors. Here is how strongly CBN acts on each. CB1Brain & nervous systemWeak / indirect Weak CB1 activity – about one-tenth as strong as THC, so only very mildly intoxicating. CB2Immune system & bodyPartial Binds CB2 a little more strongly than CB1. In the plant How CBN is Made Unlike most cannabinoids, CBN does not come straight from CBGA. It is a breakdown product: THC slowly turns into CBN as it oxidises over time. This is why fresh cannabis has very little CBN, and why the amount rises the longer a product is stored. Comes fromDelta-9-THC→ over time →CBN Good to know Safety and Side Effects There is not much safety research on CBN by itself. Because it is mildly intoxicating, it could in theory add to the effects of THC. Few side effects have been reported, but this reflects how little it has been studied rather than proof that it is risk-free. Speak to your prescriber before using a CBN product for sleep, especially alongside other sleep medicines. Questions CBN: Common Questions Does CBN help you sleep? CBN is often sold as a sleep aid, but the research is limited. Some of its reputation may come from other compounds in aged cannabis rather than CBN itself. Speak to your prescriber before using it for sleep. Where does CBN come from? CBN is not made directly by the plant. It forms slowly when THC is exposed to air, heat and light over time, which is why older cannabis tends to have more of it. PreviousCBG NextDelta-8-THC Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References ElSohly, M.A. and Gul, W. (2014) ‘Constituents of Cannabis sativa’, in Pertwee, R. (ed.) Handbook of Cannabis. Oxford: Oxford University Press, pp. 3-22. Morales, P., Hurst, D.P. and Reggio, P.H. (2017) ‘Molecular targets of the phytocannabinoids: a complex picture’, Progress in the Chemistry of Organic Natural Products, 103, pp. 103-131. doi: 10.1007/978-3-319-45541-9_4. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026).

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Delta-9-THC: What It Is, Effects and Safety | PatientsCann UK Skip to main content Back to Cannabinoids Guide THC Delta-9-THC delta-9-THC, dronabinol pronounced: DEL-tuh nine tet-ruh-hy-droh-kuh-NAB-ih-nol The main active cannabinoid – the one that makes you feel “high”. Neutral cannabinoidFormula: C21H30O2Intoxicating: Yes TypeNeutral FormulaC21H30O2 IntoxicatingYes Key focusPain & nausea Delta-9-tetrahydrocannabinol · 314.5 g/mol The molecule Chemical structure This is the accurate skeletal structure of Delta-9-THC, drawn from PubChem data. Each corner and line-end is a carbon atom, and the red O marks oxygen. Its formula is C21H30O2 and it weighs 314.5 g/mol. Pain reliefAppetiteAnti-sicknessEuphoria About What is Delta-9-THC? Delta-9-THC is the most famous cannabinoid, and the one that makes cannabis feel intoxicating. It was first identified by scientists Raphael Mechoulam and Yechiel Gaoni in 1964. When people talk about how “strong” a cannabis product is, they usually mean how much THC it contains. The fresh plant does not actually hold much THC. It makes an acid called THCA instead. THC only appears once the plant is dried, then heated, vaped or smoked. This is why the THC number on a lab report tells you how much becomes available after heating. In the body How THC Works THC works by fitting into the CB1 receptor, which sits mostly in the brain and nervous system. Switching CB1 on changes how nerve cells pass messages. This is what causes the “high”, and it is also how THC eases pain, calms nausea and brings on hunger. THC acts on CB2 receptors too, which are linked to the immune system. UK specialists may consider a THC-containing medicine for problems such as long-term pain, muscle spasms in multiple sclerosis, and sickness from chemotherapy, when licensed treatments have not helped. The right amount is very personal, so prescribers usually start low and go slow. Receptor snapshot Where THC Acts The endocannabinoid system has two main receptors. Here is how strongly Delta-9-THC acts on each. CB1Brain & nervous systemStrong Switches on CB1 in the brain and nerves. This is what causes the “high”, and also eases pain, nausea and appetite loss. CB2Immune system & bodyPartial Also activates CB2 on immune cells, which is linked to inflammation. In the plant How THC is Made THC begins life as THCA, its raw acid form, which the plant builds from the “mother” cannabinoid CBGA. THCA on its own is not intoxicating. Heat removes a small piece of the THCA molecule (a carbon dioxide group) and turns it into THC. This step is called decarboxylation. Later, as cannabis ages and meets air and light, THC slowly changes again into CBN. Comes fromTHCA→ add heat →Delta-9-THC Good to know Safety and Side Effects THC can cause a fast heartbeat, dry mouth, red eyes, dizziness, and feelings of anxiety or paranoia, especially at higher doses or in people who are new to it. It affects your ability to drive and use machinery. It is not recommended in pregnancy, and heavy long-term use can lead to dependence in some people. If you ever take too much and feel unwell, find a calm space, sip water, and wait it out; the feeling passes. Always follow your prescriber’s dose and never mix your medicine with alcohol or other drugs without advice. Questions Delta-9-THC: Common Questions Will THC get me high? Yes. Delta-9-THC is the cannabinoid responsible for the “high” feeling. This happens because it switches on CB1 receptors in the brain. The amount you feel depends on the dose, the product and your own tolerance. Is THC legal in the UK? THC is a controlled drug, but since November 2018 specialist doctors can legally prescribe cannabis medicines that contain THC. You cannot buy high-THC products legally without a prescription. PreviousCBGA NextCBD Back to full Cannabinoids Guide Important: This page is for education only. It is not medical advice. Cannabinoid research is still developing, and many studies have been done in cells or animals rather than people. Always speak to your prescriber before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Gaoni, Y. and Mechoulam, R. (1964) ‘Isolation, structure, and partial synthesis of an active constituent of hashish’, Journal of the American Chemical Society, 86(8), pp. 1646-1647. doi: 10.1021/ja01062a046. Pertwee, R.G. (2008) ‘The diverse CB1 and CB2 receptor pharmacology of three plant cannabinoids: delta-9-tetrahydrocannabinol, cannabidiol and delta-9-tetrahydrocannabivarin’, British Journal of Pharmacology, 153(2), pp. 199-215. doi: 10.1038/sj.bjp.0707442. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 29 July 2026).

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PatientsCann UK | Already vaped medical cannabis (AVB): a practical guide Skip to content Legal & Support AVB / ABV General information Already vaped medical cannabis (AVB): a practical guide for patients Many patients who lawfully use prescribed cannabis flower in a dry-herb vaporiser ask what to do with the material left behind after vaping. It is often called already vaped bud (AVB), or already been vaped (ABV). There is very little official guidance on the subject, but the law does provide some helpful answers. PatientsCann UK Legal & Support Plain-English guide On this page What the law says Is AVB lawful? Good practice Why keep AVB? A sensible approach General information, not legal advice This guide explains how the current law appears to apply. It is not legal advice, the law may change over time, and every patient’s circumstances are different. The short answer No duty to destroy Nothing in the law requires you to destroy cannabis the moment it has been vaporised. No time limit There is no set limit on how long lawfully prescribed cannabis may be kept. No container rule Your medication does not have to stay in its original dispensing container at all times. Quick reader poll Be honest: what happens to your AVB? A quick, anonymous poll for community interest. One tap and you are done. What do you do with your already vaped bud? Bin it right away Straight in the bin, no ceremony. Feed it to the soil Compost it and let the garden say thanks. Store it and forget it It is in a jar somewhere. Probably. Save it to re-use Waste not, want not. Dispose of it at a pharmacy Hand it in at a local community pharmacy for safe disposal. Not applicable, I do not use flower No dry-herb vaping, so no AVB to deal with. I am happy to share my anonymous answer with PatientsCann UK. Cast my vote Please note. This poll is for community interest only and is completely anonymous. It is not medical or legal advice. Whatever your answer, keep following your prescriber’s directions. Unwanted medicine can be handed in at a local community pharmacy for safe disposal, as pharmacies in the UK accept unwanted medicines from private households as part of their NHS essential services. Thanks for voting! Your answer is in, and it stays anonymous. However you handle your AVB, remember to follow your prescriber’s directions. Unwanted medicine can be handed in at a local community pharmacy for safe disposal. The legal position What does the law say? Prescribed cannabis is a controlled drug Cannabis-based products for medicinal use (CBPMs) prescribed by a specialist doctor are Schedule 2 controlled drugs under the Misuse of Drugs Regulations 2001. The Misuse of Drugs Act 1971 makes it unlawful to possess a controlled drug unless you are authorised to do so. For patients, that authority comes from the Misuse of Drugs Regulations 2001, once the medicine has been lawfully prescribed and supplied to you. What the legislation does not say Importantly, there is no provision in the legislation that: requires patients to destroy cannabis immediately after it has been vaporised; imposes a time limit on how long prescribed cannabis may be possessed; or requires medication to remain in its original dispensing container at all times. The key question Does AVB remain lawful? There is currently no reported UK court decision dealing specifically with already-vaped prescribed cannabis. However, AVB originates from medication that has been lawfully prescribed and supplied. The legislation does not say that it becomes unlawful simply because it has been heated in a vaporiser. While no definitive legal ruling exists, there appears to be no statutory requirement to dispose of it immediately after use. AVB starts life as lawfully prescribed medicine. Nothing in the legislation says it stops being lawful the moment it has been heated. PatientsCann UK, Legal & Support Sensible habits Good practice Although the law does not specifically require it, a few simple habits can make the origin of your AVB clear if anyone ever asks. Patients may wish to do the following. 1 Keep your prescription or dispensing label Hold on to your current prescription, or the label from your dispensed medication. 2 Carry proof of identity when travelling If you travel with your medication, keep proof of identity with you. 3 Reuse the original container If you are keeping AVB for later disposal, store it in the original empty dispensing container where practical. 4 Keep it separate Avoid mixing AVB with non-prescribed cannabis or any other substance. Why this helps. Together, these steps help show that the material came from medication lawfully prescribed to you, should any question ever arise. Everyday reasons Why might someone keep AVB? Some patients hold on to AVB for a short time before disposing of it, for entirely everyday reasons, including: convenience; waiting until they are home before disposing of it; or collecting it so it can be disposed of safely in one batch. Safe disposal is a genuine reason to hold on to it. The NHS advises that unwanted medicine should be returned to a pharmacy for safe disposal rather than put in household waste, so keeping AVB until you can hand it in is a responsible thing to do. The law does not distinguish between these situations. Keeping AVB briefly for any of these reasons is treated no differently from keeping it for any other. Putting it together A sensible approach Keep following your prescriber’s directions on how to use your medication. If you do keep AVB, a clearly labelled container that links it to your prescription can help show where it came from. Keep it separate from your fresh medication, though: returning AVB to a bottle that still holds unused flower can affect your dosing and contaminate medicine you have not yet used. None of this appears to be a legal requirement, but it is simple and sensible. In summary The bottom line Current UK legislation does not appear to

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A plumber, a prescription, and a fair hearing at work | PatientsCann UK Skip to content Patient Story A plumber, a prescription, and a fair hearing at work When Dean Carroll told his employer he had been prescribed medical cannabis, he expected a fight. Instead he got a fair, individual assessment and kept the safety-critical job he loves. He wants other patients to know it can be done. DC Dean CarrollPlumber, supervisor & PatientsCann UK volunteer Cheshire, UK Housing association Dean Carroll — plumber, supervisor and PatientsCann UK volunteer, Cheshire. Dean Carroll is a plumber and supervisor for a housing association. He is also one of the estimated tens of thousands of people in the UK who hold a legal prescription for medical cannabis. When those two facts met at work, the result was not the one many patients fear. Rather than wait to be found out, Dean chose to be open. He told his employer about his prescription up front. Because his job is safety-critical, he was asked to attend an occupational health assessment to check whether he could keep doing it safely. It is exactly the kind of moment that stops many patients from ever telling their employer at all. What happened next, Dean says, should be the template for how these situations are handled. He has since joined PatientsCann UK as a volunteer, and he is sharing his experience so that other patients, and the employers who manage them, can see that a prescription need not be the end of a career. The fact that I am prescribed medical cannabis did not automatically mean I was considered unfit to work. The assessment focused on my individual circumstances and my ability to do my role safely. — Dean Carroll How it was handled What good practice looked like Dean’s employer and occupational health team followed a clear, methodical process. Each step looked at the real question: can this person do this job safely? Here is how it unfolded. 1 Dean disclosed his prescription He proactively told his employer he had been prescribed medical cannabis, rather than keeping it hidden. Because his role is safety-critical, an occupational health assessment was arranged. 2 He shared the clinical detail Dean provided information on his prescribed dosage, the potential effects and the impairment window after dosing, and any other medication he was taking, so the assessment was based on facts, not assumptions. 3 Occupational health assessed his fitness to work The assessment concluded there were no concerns about Dean’s ability to carry out his work safely, including the driving that forms part of his role. 4 A workplace risk assessment considered the real duties His employer then assessed the specific risks tied to his role. Dean also supplied guidance from his medical cannabis clinic on the current UK position on driving while prescribed. 5 Dean kept his job Following the assessment and a sensible risk-management plan, Dean was able to carry on in his role. Safety standards were maintained, and a skilled employee was retained. The risk assessment looked squarely at the demanding parts of the job, not at the label on his prescription: Power tools Lone working Working at height Driving The way my employer and occupational health team handled my situation should be seen as an example of good practice. It was professional, thorough, and, most importantly, I felt listened to and understood. — Dean Carroll Clearing up the confusion A prescription is not an automatic barrier Dean hopes his story challenges some stubborn misconceptions. Being prescribed medical cannabis should not, on its own, be treated as a bar to employment or career progression. What matters is the individual, their medication, and the honest requirements of the role. Judge the person, not the label Assess someone’s actual ability to work safely, not an assumption based only on the fact of a prescription. Open communication works Disclosing early let Dean explain his dosage, his effects, and when they occur, so decisions rested on facts. Safety is not compromised A proper risk assessment lets employers support staff while still holding appropriate health and safety standards. My experience has shown me it is possible to take medical cannabis seriously as a medication, take workplace safety seriously, and still support an employee to do their job to the best of their ability. — Dean Carroll Dean is clear that he is not asking for special treatment, only for a fair and individual hearing. There are, he points out, many patients across the UK who are prescribed medical cannabis and who are fully capable of working, contributing, and carrying out their roles safely. He hopes that by speaking up, he can encourage more open conversation between patients, employers and occupational health professionals, and help others feel able to disclose without fear of losing the work they depend on. This is one patient’s personal experience, shared to support others. It is not legal or employment advice, and every workplace is different. For your rights at work, see our Employment guide, and read the current UK position on driving while prescribed. Over to you Have you been through something similar? Tell us. Real stories change minds. Whether your experience at work, or anywhere else, was positive like Dean’s or a good deal harder, sharing it helps other patients feel less alone and helps us push for fairer treatment. Tell us as much or as little as you like. Share your story Fields marked with an asterisk are required. Please do not include medical records or other patients’ details. We will never publish anything without asking you first. Thank you for sharing your story. We have received it and a member of our team will be in touch. Your words help other patients feel understood. Your name * Email address * Only used to reply to you. Your job or situation (optional) What is your story about? Please select…Employment or the workplaceOccupational health or safety-critical workDrivingHousingTravelStigma or discriminationA positive experienceSomething else Your story, in your own words

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PatientsCann UK | Free the weed? The case for self-sustainability Skip to content News Cannabis policy Patient view Free the weed? A new campaign, and the case for self-sustainability Legal Growers UK has launched a national campaign for a regulated British cannabis model. We report what it proposes, set out why we think patients should be able to grow their own, and ask you one simple question: legalisation, or decriminalisation? PatientsCann UK News and Advocacy 21 July 2026 On this page The campaign The blueprint Our view The evidence Your view References Where this article stands We are reporting on a campaign run by Legal Growers UK, an organisation we are not part of. We share it so patients can read it and make up their own minds. This is not legal or medical advice, and it is not an endorsement of any party or campaign. Why this matters The market never left The campaign argues prohibition did not remove the cannabis trade. It handed control to an illegal market that checks no age, tests no product, and pays no tax. Patient access Many patients tell us a legal prescription can work well, but the cost of it puts safe, legal medicine out of their reach. Self-sustainability Our own belief is plain: patients should have a route to grow their own, safely and legally, at home. The news A national campaign for a regulated British model On Friday 17 July 2026, Legal Growers UK launched a national campaign for what it calls a careful, safe British model for regulating cannabis. The group is a not-for-profit, run by volunteers from across the United Kingdom.1 Its argument is short. Prohibition has not made cannabis go away. Instead, the campaign says, the trade has been left in the hands of an illegal market that does not check age, does not test its product, and does not pay tax. It wants cannabis placed under clear, enforceable rules so that government, police, and local councils have better tools to keep the public safe. The campaign hashtag is #LegalGrowersNotTraffickers. To meet the public face to face, the volunteer team is at Borofest 2026, the Borofest Glass Festival, which runs from 17 to 20 July at Overstone, Northampton. The organisation says it is a growing team and welcomes new volunteers and supporters. The country is hurting. Our streets and schools are no longer safe, patients have poor access, and it is a drain on the public purse when other countries have profited to the tune of billions. Dan Balderson, Chief Executive, Legal Growers UK The detail What the campaign proposes Rules to protect people Sales to adults only, with strict age verification. Plain packaging, free of cartoon-style designs. Outlets kept away from schools and playgrounds. Products laboratory-tested and labelled with their exact strength. Employers keep the right to require staff to be sober and fit for duty. Fairness and funding Lawful use in a person’s own private time protected. Councils given clearer powers over nuisance such as smoke or smell. Old, minor cannabis records cleared automatically. A share of tax revenue directed to NHS mental health services, youth education, and enforcement. These are the campaign’s own proposals, summarised in plain terms. We set them out so you can weigh them up, not to tell you whether to back them. Our view The case for self-sustainability Here is where we do take a side, and we are clear about it. PatientsCann UK believes that patients should be able to look after their own health. For some, that includes the right to grow a small amount of their own medicine at home. We call this self-sustainability. The reason is simple, and it comes straight from patients. A prescription can be safe and effective, but many people cannot afford one. When the legal route is too expensive, patients are pushed towards a market they cannot trust, or they go without. Growing your own is low cost, it keeps money away from organised crime, and it puts a patient back in control of their own care. This is not a call to ignore safety. It is a call to give patients a fair, legal path to self-sustainability, whatever wider route the country chooses. On that narrow point, we support the spirit of freeing the plant, so that the people who rely on it are no longer treated as criminals. It aligns with all my values: community safeguarding, and people like me cannot afford a prescription. My initials are GYO, Grow Your Own, and it is about time. Gary Youds, Chillin’ Rooms Owner and Legal Growers UK Board Member The evidence What the international research shows The campaign points to evidence from abroad. A second annual evaluation of Switzerland’s regulated cannabis pilot trials, produced for the Swiss Federal Office of Public Health and published in November 2025, found that controlled legal access moved adult buyers away from the illegal market. It recorded no negative effects on public order or health to date.2 Legal Growers UK cites this as international evidence, and does not claim the Swiss model is the same as its own plan. We would add our own note of care: one country’s pilot is not proof for another, and early findings like these should be read carefully, not treated as a promise. Read evidence with care. Early results from one country’s trial cannot tell us exactly what would happen in Britain. They are a signal worth studying, not a guarantee. Over to you Legalisation or decriminalisation. Where do you stand? Choose your stance: legalisation, decriminalisation, or still deciding These two words often get used as if they mean the same thing. They do not. Pick the one closest to your view to see what it would mean in plain terms, then submit your answer. Responses are anonymous, and no personal details are collected. Legalisation Legal to grow, buy and sell, under strict rules Decriminalisation No criminal record for personal use, supply stays illegal Still deciding I want to weigh

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PatientsCann UK | What the McCarthy Tribunal Decision Really Says Skip to content News & Analysis Workplace Rights Driving & the Law What the McCarthy tribunal decision really says about medical cannabis, driving and work Reduced to a headline, this case looks like a ruling that medical cannabis patients cannot work or drive. That is not what the tribunal decided. Here is what the judgment in Miss L McCarthy v Kirklees Metropolitan Council actually found, and what it means for patients and employers. PatientsCann UK News & Advocacy Employment tribunal analysis On this page Context Not a blanket ban Treated differently? Missing information Occupational health Where it went wrong The wider lesson The reporting problem Bottom line Letter template References Please note This article is general information and analysis of a published employment tribunal decision. It is not legal or medical advice. If you face a workplace or driving issue involving your prescription, seek advice specific to your circumstances. Why this matters Not a blanket ban The tribunal did not find that patients are automatically unfit to work or drive. A narrow question It was about one claimant, in a safety-sensitive role, against a specific background. Misreported Headlines framing this as “cannabis means you cannot work” distort the judgment. Background Context: why this case has caused concern At first glance, the tribunal decision in Miss L McCarthy v Kirklees Metropolitan Council looks like exactly the sort of case the medical cannabis community has feared: a patient has a lawful medical cannabis prescription, wants to return to work, and the outcome appears to suggest that medical cannabis use means you cannot safely work or drive as part of your job. Read through that lens, and reduced to a newspaper headline, it is easy to see why people are worried. But that is not what the tribunal actually decided. The important distinction is that the tribunal did not find that medical cannabis patients are automatically unfit for work or unable to drive. It found that, in this particular situation, the employer was entitled to pause and seek further information before allowing a full return to normal duties, because the job involved vulnerable service users and some driving, and because the employer did not yet have enough role-specific and prescription-specific information to complete its safety assessment. The claimant had a diagnosis of Emotionally Unstable Personality Disorder / Borderline Personality Disorder, which the employer knew about. She had also experienced a serious mental-health crisis in September 2023, had been admitted to psychiatric hospital, and was absent from work. During this period, she also disclosed previous illegal drug use, including cocaine and cannabis. She later obtained a private medical cannabis prescription, and provided her employer with some information about medical cannabis, including clinic correspondence and external guidance. At around the same time, the employer received a PIPOT safeguarding referral involving alleged aggressive or threatening behaviour reported through NHS and police channels. Because the claimant worked with vulnerable service users, the employer treated this as a significant safeguarding issue and required a further enhanced DBS check. So the tribunal was not looking at a simple question of “can someone prescribed medical cannabis work and drive?” It was looking at a much narrower question: was this employer acting unlawfully when it paused, asked for more information, sought occupational-health advice, considered safeguarding concerns, and managed a staged return to work in this specific set of circumstances? The tribunal answered no. The key point This was not a blanket ban case A central concern is that the decision might create a precedent that employers can say “there is not enough information about medical cannabis, so we cannot safely let you drive.” But that is not what the tribunal found. The claimant alleged that she was told in April 2024 that she could not drive as part of her duties. The tribunal rejected that allegation. It found that no driving prohibition was imposed. There had been discussion about medical cannabis, driving law, and the statutory defence where medication is prescribed and taken as directed, but the tribunal found the employer did not ban her from driving. That is important. The case does not stand for the proposition that an employer can automatically prevent a medical cannabis patient from driving for work. It stands for the much narrower proposition that, where there are specific safety-related questions, an employer may ask for relevant information before reaching a decision. UK driving law also does not impose a blanket ban on people taking prescribed medicines. GOV.UK explains that a person may drive after taking certain prescribed medicines if they have been prescribed them, have followed healthcare advice, and the medicine is not causing them to be unfit to drive. The lawful position. Not “medical cannabis equals no driving,” but rather: a patient may drive if the medicine is lawfully prescribed, taken as directed, and they are not impaired or unfit to drive. Discrimination argument Why the tribunal did not see this as cannabis being treated differently The claimant argued that the employer had no business asking about her driving while taking prescribed medication, and that other medicines were not treated in this way. The tribunal rejected that argument. It accepted evidence from HR that similar enquiries would be made if any employee’s prescribed medication was suspected to affect their ability to perform their duties safely. This is the crucial distinction. The tribunal did not say “medical cannabis is uniquely risky, so employers can restrict it.” It said, in effect, if any medication may affect safe performance in a particular role, the employer can make proportionate enquiries. That matters because many prescribed medicines can affect driving, judgement, alertness, coordination, or reaction time, for example opioids, benzodiazepines, sedatives, strong painkillers, some psychiatric medications, and other controlled medicines. GOV.UK’s drug-driving guidance is framed around impairment and prescribed medicines generally, not medical cannabis alone. The problem would be different if an employer scrutinised medical cannabis patients but ignored comparable risks from other prescribed medicines. That could potentially

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Case study REX v Saleem Aziz Acquitted Cleared in court: a medical cannabis patient’s drug driving appeal Sal Aziz was stopped by police, charged, and convicted. Then the Crown Court overturned it. Here is what happened, what the law really says, and what it means for patients, police, lawyers, and the courts. PatientsCann UK Drug driving and the medical defence Winchester Crown Court, 10 February 2026 Read the full report (PDF) On this page The story What happened The law Four myths Medical and science The evidence Why it was won What is broken Guidance Case file References This is not legal or medical advice This is a personal account and a public resource, based on real case papers, public reports, and the author’s understanding of the law. If you face a drug driving charge, get advice from a qualified solicitor and your medical team where you can. This case is a strong example, but every case turns on its own facts and evidence. The case at a glance Blood THC 3.6 micrograms per litre of blood, over the 2 microgram limit. Charges Two, under sections 4 and 5A of the Road Traffic Act 1988. Hearings Three court hearings before the right result was reached. Outcome Cleared. The conviction was overturned at the Crown Court. Overview The story in short Sal Aziz is a patient who is legally prescribed medical cannabis. In March 2024, police stopped the car he was driving as friends were being taken home from an event. He passed the roadside alcohol test. He told the officer straight away that he was a prescribed patient. A roadside drug swab showed cannabis, and he was asked to do a set of roadside tasks called a Field Impairment Test. He was arrested. A blood test later showed 3.6 micrograms of THC per litre of blood. The legal limit is 2 micrograms per litre. He was charged under two parts of the Road Traffic Act 1988: section 4 (driving while unfit) and section 5A (driving over the drug limit). The magistrates’ court dropped the section 4 charge but found him guilty of the section 5A offence. He was fined and banned from driving for 36 months. He appealed. On 10 February 2026, at Winchester Crown Court, Sal Aziz was cleared. The prosecution could not prove, beyond reasonable doubt, that his medical defence did not apply. The prosecution had argued his medicine was unlawful because more than 30 days had passed since the prescription, and because it was past its labelled use-by date. The court rejected this. The pharmacist expert, Umesh Chauhan, agreed that the “30 days” idea is best-practice guidance, not criminal law. The judge compared it to drinking milk after its best-before date. Passing the date does not make it unlawful to use. Crown Court reasoning, as described in the report Step by step What happened 1 About seven months before the stop A separate police encounter about his prescribed cannabis caused him serious distress. NHS notes record shaking, anxiety, and a hospital visit. Police contact was a known trigger for his physical symptoms. 2 31 March 2024: the stop On the A303, his car was stopped as part of an operation on vehicles leaving an event. There was no crash and no problem with his driving. The officer noted that he seemed nervous and shaky. 3 The roadside tests The alcohol breath test was negative. The roadside drug swab showed cannabis. He told the officer at once that he was a prescribed patient. He was then asked to do the Field Impairment Test: an eye check, a balance test, walking in a line, and touching his nose. 4 The arrest The officer treated the shaking and balance problems as signs of drug impairment. But these are also listed in his medical notes as symptoms of anxiety. He was arrested and his prescribed cannabis, in its labelled packet, was found. No proper interview about his condition took place. He was released to wait for blood results. 5 The blood result The blood test showed 3.6 micrograms of THC per litre of blood. This was over the 2 microgram limit. Nothing else was found. 6 The magistrates’ court The section 4 (unfit) charge was dropped. He was convicted of the section 5A (over the limit) charge. The court wrongly accepted that the medical defence did not apply because the medicine was “expired” or used beyond 28 to 30 days. He was fined and banned from driving for 36 months. 7 The appeal He appealed to the Crown Court, arguing that the medical defence applied. He brought prescription records, NHS notes, expert pharmacist evidence, and the science on THC. 8 10 February 2026: the result The appeal was allowed. The conviction was overturned. The prosecution had not disproved the medical defence. Plain English The law, in plain words Two parts of the Road Traffic Act 1988 matter here. They ask different questions, and it helps to keep them apart. Section 5A: over the drug limit It is an offence to drive with a named drug above a set limit in your blood. For cannabis, the limit is 2 micrograms of THC per litre of blood. This is a strict offence: the prosecution does not have to prove your driving was actually affected. The limit is set by the Drug Driving (Specified Limits) (England and Wales) Regulations 2014. Section 4: unfit through drugs This is a different offence. Here the prosecution must prove that your driving was actually impaired, and that a drug caused that impairment. This usually rests on observations, the Field Impairment Test, and expert evidence. The medical defence (section 5A(3)) If you are a lawful patient, you have a defence to the section 5A offence. You need to show three things. 1 It was prescribed or supplied for a medical reason For a medical or dental purpose. Self-medication or illegal use does not count. 2 You took it as directed This means following advice about driving after use,

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PatientsCann UK | Patient coalition appeal over plans to restrict CBD Press release Patient rights Patient groups across Europe launch an appeal over plans to restrict CBD A group of patient organisations, including PatientsCann UK®, has launched a public appeal and petition. They are worried about plans in the Czech Republic to treat CBD as if it were a chemical used to make illegal drugs. Their message is short: share the evidence, talk to the patients affected, and decide in the open. Sign the appeal PatientsCann UK® Coalition press release Prague, 17 June 2026 On this page In short Why it matters What we are asking Sign the appeal About the coalition References PatientsCann UK® is one of eight patient organisations in this coalition. The coalition campaigns on health policy and patient rights. It does not sell, promote, or link to any CBD product. In short What is happening Patient groups across Europe and beyond have launched a public appeal and petition called Care Before Discrimination is a Human Right. The worry Czech officials may treat CBD as a drug precursor, a chemical used to make illegal drugs, and limit how it can be handled. Not a ban on rules The coalition backs safety testing, honest labels, age limits, and real action against dangerous products. The ask Share the evidence, talk to the patients affected, and decide openly. You can add your name to the appeal. The background Why it matters CBD (cannabidiol) is a substance from the cannabis plant. It does not make a person feel high. On its own, it is not controlled under the main international drug laws. A purified CBD medicine is already approved across the European Union to treat severe forms of epilepsy, a condition that causes seizures. Because of this, the coalition says a sweeping restriction needs strong evidence behind it. It points to the International Narcotics Control Board, the United Nations body that watches drug controls. By that board’s own account, the proof that CBD is used to make illegal lab-made cannabinoids is limited. There is also a practical worry. The products that are truly risky are synthetic and semi-synthetic cannabinoids, which are part or fully man-made cannabis-like chemicals, often sold through grey-market channels. These need direct enforcement, age limits, and quality rules. The appeal is published just hours before the Czech Government’s Council for Addiction Policy meets on the afternoon of 17 June 2026. The unintended risk. If safe, tested CBD is pushed out of legal shops, demand will not disappear. It will move to an unregulated market, where contamination with heavy metals, pesticides, and solvents is far harder to catch. Patients aren’t asking for a loophole. We’re asking not to be pushed into the shadows. If the Government believes CBD should be restricted, show the evidence, listen to the patients it affects, and explain why the rules we already have aren’t enough. Care before discrimination means deciding in daylight. Pavel Kubů, KOPAC (Patient Association for Cannabis Treatment), Czech Republic What the coalition supports Clear quality standards. Testing for harmful substances. Honest labelling. Age limits. Real enforcement against dangerous synthetic products. What it is not asking for This is not a campaign against regulation, and it is not a request for a loophole. What the coalition objects to is a quiet, paperwork-only shortcut that rests on evidence no one has published. The appeal What we are asking The appeal calls on the Czech Government, European Union institutions, and United Nations drug-control bodies to: 1 Publish the evidence Share the proof before any CBD restriction is brought in. 2 No quiet shortcuts Avoid hidden or paperwork-only measures that skip public scrutiny. 3 Respect patient choice Respect patients’ freedom, dignity, and right to make informed decisions. 4 Regulate, do not ban Set fair and measured rules rather than a blanket prohibition. 5 Target the real risk Aim enforcement at dangerous synthetic and semi-synthetic products. 6 Consult patients first Talk to patient organisations before decisions are made. Add your name to the appeal The petition is open now. The full appeal, the evidence behind it, and the press kit are on the campaign site. The appeal is published in six languages. Sign the appeal Read the full appeal Who we are About the coalition Care Before Discrimination is a Human Right is an open coalition of patient organisations, with more joining. It campaigns on health policy and patient rights, and it does not promote, sell, or link to any CBD product. The appeal’s full title is “Care Before Discrimination: Patients’ Rights and the Proposed Restriction of CBD”. Aube Canada Centrum Paraple Czech Republic Dosemociones Spain Fuck Cancer Czech Republic HARP, Human Application Research Program Czech Republic KOPAC Czech Republic PatientsCann UK® United Kingdom Verein Medcan Switzerland Coalition media contact media@cbdhumanright.org Spokespeople are available in English, Czech, Spanish, French, German, and Italian. The team replies within a working day, and faster around procedural deadlines. PatientsCann UK® press press@patientscann.org.uk For media enquiries about PatientsCann UK® and our part in the coalition. Note The appeal is available in six languages (English, Czech, Spanish, French, German, and Italian) on the campaign site and in the downloadable press kit. In the Kanavape case, the European Union’s top court held that a member state may not ban the sale of CBD lawfully produced in another member state unless a restriction is necessary and proportionate, meaning fair and no more than is needed. The CBD in that case was produced in the Czech Republic. HHC, a semi-synthetic cannabinoid, was added to Schedule II of the 1971 Convention on Psychotropic Substances by the United Nations Commission on Narcotic Drugs. The decision took effect on 6 December 2025. The primary sources behind the appeal are listed in full below. References References follow the Harvard style. Sources with no named author are listed by the responsible body. All links were checked on 17 June 2026. 1World Health Organization (2018) Cannabidiol (CBD): critical review report. Expert Committee on Drug Dependence, fortieth meeting, Geneva, 4 to

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From menstrual pain to menopause, endometriosis to anxiety, a growing body of research and real patient experience is reshaping how women access and use prescribed cannabis in the UK.

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Eudesmol – PatientsCann UK Skip to main content Back to Terpenes Guide Eudesmol beta-Eudesmol pronounced: YOO-dez-mol A sweet, woody terpene from eucalyptus. Early research looks at appetite and blood vessels. Oxygenated sesquiterpene Boiling point: 295°C Terpene type Oxygenated sesquiterpene Boiling point 295°C Primary aroma Woody Key effect Appetite Aroma profile How it Smells The aroma of Eudesmol is described as: SweetWoodyWaxyBalsamEarthy Found naturally in: Eucalyptus, cypress, ginger, balsam, certain conifers Effects Linked Effects Boosts appetiteProtects blood vesselsAnti-tumour research These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Eudesmol? Eudesmol is a sweet, woody terpene with a slightly waxy, balsam-like smell. It is found in eucalyptus, in cypress and ginger, and in the resin of some conifer trees. It comes in a few closely related forms, with beta-eudesmol being the best studied. It is a heavy, oxygen-carrying sesquiterpene, so it tends to stay behind in heated products rather than lifting off quickly. Effects in detail What the Research Says Beta-eudesmol has been studied in the laboratory for several effects. Some animal work suggests it may affect appetite, and other studies have looked at how it acts on blood vessels and at possible anti-tumour activity (Nuutinen, 2018). All of this is early research in cells and animals. None of it is proof of benefit in people, and it should not guide treatment choices. Everyday sources Where You Find it in Daily Life You meet eudesmol in eucalyptus and cypress, in ginger, and in balsam resins. These plant oils are its richest everyday sources. Its warm, woody smell means it is used in perfumery and in some traditional herbal preparations. Research Key Studies Nuutinen (2018) reviewed the laboratory evidence on eudesmol, including its effects on appetite and blood vessels and the early anti-tumour research. Its chemistry is recorded in public databases (National Center for Biotechnology Information, 2025). Human studies are still needed. PreviousGuaiol NextMyrcene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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Caryophyllene-oxide – PatientsCann UK Skip to main content Back to Terpenes Guide Caryophyllene-oxide Caryophyllene oxide pronounced: kair-ee-oh-FIL-een OX-ide A woody, sweet terpene made when caryophyllene meets oxygen. The smell sniffer dogs are trained to find. Oxygenated sesquiterpene Boiling point: 279°C Terpene type Oxygenated sesquiterpene Boiling point 279°C Primary aroma Woody Key effect Germ-fighting Aroma profile How it Smells The aroma of Caryophyllene-oxide is described as: WoodySweetSpicyDryEarthy Found naturally in: Cloves, hops, rosemary, eucalyptus, black pepper, lemon balm Effects Linked Effects Fights fungusEnergisingUsed by detection dogs These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Caryophyllene-oxide? Caryophyllene-oxide is what you get when the well-known terpene beta-caryophyllene reacts with oxygen. It keeps a woody, spicy smell but turns a little sweeter and drier. It is found in cloves, hops, rosemary and eucalyptus. It is a heavier, oxygen-carrying sesquiterpene, so it does not evaporate as fast as the light citrus terpenes (Booth and Bohlmann, 2019). Effects in detail What the Research Says Caryophyllene-oxide is the chemical that drug-detection dogs are trained to smell, because it is a steady marker found in cannabis. In the laboratory it has been studied as an anti-fungal and for its effects on blood platelets (Nuutinen, 2018). These findings come from cell and animal studies. They are interesting starting points rather than proven treatments. Everyday sources Where You Find it in Daily Life You meet caryophyllene-oxide in cloves, in hops, in rosemary and in eucalyptus. It also forms slowly when foods and oils that contain caryophyllene are stored and exposed to air. Its warm, woody smell means it appears in perfumes and in some food flavourings. Research Key Studies Nuutinen (2018) reviewed the laboratory work on caryophyllene-oxide, including its anti-fungal activity and its effect on blood platelets. Its chemistry is recorded in public databases (National Center for Biotechnology Information, 2025). As ever, human evidence is still being gathered. Previousγ-Elemene NextHumulene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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γ-Elemene – PatientsCann UK Skip to main content Back to Terpenes Guide γ-Elemene gamma-Elemene pronounced: EL-uh-meen A sweet, dry, fruity scent found in myrrh. Studied in the laboratory for possible anti-cancer effects. Sesquiterpene Boiling point: 252°C Terpene type Sesquiterpene Boiling point 252°C Primary aroma Sweet Key effect Anti-cancer research Aroma profile How it Smells The aroma of γ-Elemene is described as: SweetFruityDryWoodySpicy Found naturally in: Myrrh, celery, mint, lemongrass, certain spices Effects Linked Effects Studied for anti-cancerAnti-inflammatory These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is γ-Elemene? Gamma-elemene is a larger terpene with a sweet, dry, slightly fruity smell. It is part of the scent of myrrh, an old resin used in incense and medicine for thousands of years, and it also appears in celery and mint. It is a sesquiterpene, so it is heavier than the light citrus and pine terpenes and tends to stay in heated cannabis products longer. Effects in detail What the Research Says Gamma-elemene belongs to the elemene family, which has drawn real scientific interest for cancer research. A close relative, beta-elemene, is studied in some countries as part of cancer care, and laboratory work has explored how elemenes affect tumour cells (Nuutinen, 2018). It is very important to be careful here. This research is at the laboratory stage for gamma-elemene, and nothing on this page is a treatment or a cure. Anyone with cancer should follow the advice of their medical team. Everyday sources Where You Find it in Daily Life You meet gamma-elemene most clearly in myrrh resin and in the herbs and spices that contain it, such as celery seed and mint. Myrrh oil, used in some balms and incense, is a rich source. Its warm, slightly spicy smell means it is also used in perfumery. Research Key Studies The review by Nuutinen (2018) and wider research on the elemene family describe the laboratory interest in how these terpenes affect tumour cells. The chemistry of gamma-elemene is recorded in public databases (National Center for Biotechnology Information, 2025). Human evidence for gamma-elemene itself remains very limited. PreviousBeta-Caryophyllene NextCaryophyllene-oxide Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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α-Terpineol – PatientsCann UK Skip to main content Back to Terpenes Guide α-Terpineol alpha-Terpineol pronounced: ter-PIN-ee-ol A gentle flowery, piney scent like lilac. Linked to calm and sleep, and common in soaps and lotions. Oxygenated monoterpene Boiling point: 218°C Terpene type Oxygenated monoterpene Boiling point 218°C Primary aroma Floral Key effect Calming Aroma profile How it Smells The aroma of α-Terpineol is described as: FloralLilacPineySweetHerbal Found naturally in: Lilac, pine, cajeput oil, petitgrain, cardamom, marjoram Effects Linked Effects CalmingSleep supportAnti-inflammatory These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is α-Terpineol? Alpha-terpineol is a soft, flowery terpene with a smell often compared to lilac, with a gentle piney background. It is found in lilac flowers, in pine, and in cardamom, and it is one of the smells people find most pleasant and relaxing. It carries an oxygen atom in its structure, which gives it that rounded, almost soapy floral smell. This is why it is used so widely in cosmetics (Booth and Bohlmann, 2019). Effects in detail What the Research Says Among the things studied about alpha-terpineol, its calming and sleep-supporting quality stands out. In animal studies it has shown a sedative-like effect, and it has also been looked at for easing swelling and fighting germs (Nuutinen, 2018). These effects are seen mostly in the laboratory. They fit the relaxed feeling many people describe, but they are not yet proven in human trials. Everyday sources Where You Find it in Daily Life You meet alpha-terpineol in lilac blossom, in pine, and in many flavours and fragrances. It is one of the most common terpenes in soaps, lotions and perfumes because of its pleasant floral smell. It is also used to give a soft, sweet note to some foods and drinks. Research Key Studies Nuutinen (2018) reviewed the evidence on alpha-terpineol, describing its calming effect in animal studies and its anti-inflammatory and germ-fighting activity. Its possible part in the entourage effect has also been discussed (Russo, 2011). Its chemistry is recorded in public databases (National Center for Biotechnology Information, 2025). PreviousFenchol NextAlpha-Bisabolol Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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Fenchol – PatientsCann UK Skip to main content Back to Terpenes Guide Fenchol alpha-Fenchol, Fenchyl alcohol pronounced: FEN-kol A camphor and lemon scent from fennel and basil. Studied as a mild stimulant and germ-fighter. Oxygenated monoterpene Boiling point: 201°C Terpene type Oxygenated monoterpene Boiling point 201°C Primary aroma Camphor Key effect Germ-fighting Aroma profile How it Smells The aroma of Fenchol is described as: CamphorPineySweetLemonEarthy Found naturally in: Fennel, basil, nutmeg, aniseed, cedar, mugwort Effects Linked Effects EnergisingFights germsAntioxidant These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Fenchol? Fenchol, sometimes called fenchyl alcohol, is the terpene that gives basil much of its sweet, slightly camphor-like smell. It also has a clean, lemony piney note and is a big part of the scent of fennel. Like cineole, fenchol carries an oxygen atom, which puts it in the group called alcohols. This gives it a softer, rounder smell than the pure pine terpenes (Booth and Bohlmann, 2019). Effects in detail What the Research Says Early laboratory research has looked at fenchol as a mild stimulant and as a substance that fights germs (Nuutinen, 2018). More recently, scientists have become interested in how fenchol behaves in the gut and brain, although this work is at a very early stage. As with most terpenes, the human evidence is still thin, so these findings are best seen as clues for future research. Everyday sources Where You Find it in Daily Life You meet fenchol most strongly in fresh basil and in fennel. It also appears in nutmeg, in aniseed, and in cedar wood. Tearing a basil leaf releases a clear burst of it. Its fresh, sweet smell means it is used in perfumes and in some flavourings. Research Key Studies Nuutinen (2018) gathered the laboratory studies on fenchol, noting its mild stimulant and germ-fighting activity in cell and animal tests. Its chemical details are recorded in public databases (National Center for Biotechnology Information, 2025). Careful human research has not yet been done. Previous1,8-Cineole Nextα-Terpineol Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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1,8-Cineole – PatientsCann UK Skip to main content Back to Terpenes Guide 1,8-Cineole Eucalyptol pronounced: SIN-ee-ol The strong, fresh smell of eucalyptus. Often used to help clear the airways and sharpen focus. Oxygenated monoterpene Boiling point: 176°C Terpene type Oxygenated monoterpene Boiling point 176°C Primary aroma Eucalyptus Key effect Focus Aroma profile How it Smells The aroma of 1,8-Cineole is described as: EucalyptusFreshCoolingMintyCamphor Found naturally in: Eucalyptus, rosemary, sage, bay leaves, tea tree, mugwort Effects Linked Effects Sharpens focusEases breathingAnti-inflammatory These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is 1,8-Cineole? 1,8-cineole, also called eucalyptol, is the terpene behind the strong, fresh smell of eucalyptus. It has a cool, clearing quality that many people know from chest rubs and cold remedies. It also appears in rosemary, sage and bay leaves. Unlike the pure pine or citrus terpenes, cineole carries an oxygen atom in its structure, which is why it smells so sharp and clean (Booth and Bohlmann, 2019). Effects in detail What the Research Says Cineole is one of the better-studied plant terpenes. Research suggests it may help open the airways and ease breathing, and it is widely used in cough and cold products for this reason (Nuutinen, 2018). Some studies have also looked at whether it may help with focus and clear thinking, and at its anti-inflammatory effects. Even with this longer history, most careful studies are small, so it should not be seen as a treatment on its own. Everyday sources Where You Find it in Daily Life You meet cineole in eucalyptus and tea tree oils, in fresh rosemary and sage, and in bay leaves. It is the main active smell in many vapour rubs, throat sweets and mouthwashes. A word of care: eucalyptus oil is strong and should never be swallowed neat, especially by children. Research Key Studies Nuutinen (2018) reviewed the evidence on cineole, including its use for easing breathing and its anti-inflammatory activity. Its role in the entourage effect alongside cannabinoids has also been discussed (Russo, 2011). Its chemistry, including the oxygen in its structure, is recorded in public databases (National Center for Biotechnology Information, 2025). Previousβ-Pinene NextFenchol Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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β-Pinene – PatientsCann UK Skip to main content Back to Terpenes Guide β-Pinene beta-Pinene pronounced: BAY-tuh PY-neen A fresh, cooling pine scent. The partner of alpha-pinene, studied for mood, worry and memory. Monoterpene Boiling point: 166°C Terpene type Monoterpene Boiling point 166°C Primary aroma Piney Key effect Mood support Aroma profile How it Smells The aroma of β-Pinene is described as: PineyFreshWoodyCoolingResinous Found naturally in: Rosemary, basil, dill, parsley, hops, pine, cumin Effects Linked Effects Lifts moodEases worryHelps memory These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is β-Pinene? Beta-pinene is one of the two pine terpenes, the other being alpha-pinene. It smells fresh and piney with a cool, almost minty lift. It is found in rosemary, basil, dill and parsley, as well as in pine trees themselves. It is a light monoterpene, so it gives off that clean, woodland smell quickly. In cannabis the two pinenes often appear together and shape the bright, herbal top of the aroma. Effects in detail What the Research Says Research on the pinenes suggests they may support mood and help ease feelings of worry, and may have a small effect on memory and alertness (Weston-Green et al., 2021). Beta-pinene has also been studied as a substance that may help open the airways and calm swelling (Nuutinen, 2018). Most of this work is in animals or cells. It points in a hopeful direction but does not yet prove benefit in people. Everyday sources Where You Find it in Daily Life You meet beta-pinene every time you cook with rosemary, basil, dill or parsley. It is also in hops, in cumin, and of course in pine forests. Rubbing a sprig of fresh rosemary releases a strong dose of it. Its clean pine smell makes it common in cleaning products and air fresheners. Research Key Studies A 2021 review by Weston-Green and colleagues looked at pinene and linalool as possible terpene-based medicines for brain health, gathering the early evidence on mood, worry and memory. Nuutinen (2018) also describes beta-pinene’s airway and anti-inflammatory effects, and its chemistry is recorded in public databases (National Center for Biotechnology Information, 2025). PreviousAlpha-Pinene Next1,8-Cineole Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Weston-Green, K. et al. (2021) ‘A review of the potential use of pinene and linalool as terpene-based medicines for brain health’, Frontiers in Psychiatry, 12, 583211. doi: 10.3389/fpsyt.2021.583211. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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α-Terpinene – PatientsCann UK Skip to main content Back to Terpenes Guide α-Terpinene alpha-Terpinene pronounced: AL-fuh ter-PIN-een A woody, citrus terpene with a medicinal edge. Best known as a strong natural antioxidant. Monoterpene Boiling point: 174°C Terpene type Monoterpene Boiling point 174°C Primary aroma Woody Key effect Antioxidant Aroma profile How it Smells The aroma of α-Terpinene is described as: WoodyCitrusMedicinalHerbalFresh Found naturally in: Marjoram, cumin, tea tree, allspice, juniper, coriander Effects Linked Effects AntioxidantAnti-microbialAnti-fungal These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is α-Terpinene? Alpha-terpinene is a terpene that smells woody and citrusy with a slightly sharp, medicinal note. It is one of the main parts of tea tree oil and gives marjoram and cumin some of their warm, herby smell. It is a light monoterpene and a close cousin of gamma-terpinene. The two often appear together in the same plants. Effects in detail What the Research Says Alpha-terpinene is one of the strongest plant antioxidants found in the laboratory. It is very good at mopping up free radicals, the harmful particles that can damage cells (Nuutinen, 2018). It is also studied for fighting germs and fungus. Because it reacts so readily with oxygen, it can change over time once a plant oil is opened. This is normal, and it is why fresh oils smell brightest. Everyday sources Where You Find it in Daily Life You meet alpha-terpinene most strongly in tea tree oil, which is used in many skincare products. It is also in the herb marjoram, the spice cumin, in allspice, and in juniper. Its clean, slightly medicinal smell means it turns up in soaps, mouthwashes and household cleaners. Research Key Studies Nuutinen (2018) reviewed the laboratory evidence on alpha-terpinene, highlighting its powerful antioxidant activity and its germ-fighting and fungus-fighting effects in cell tests. Its chemistry is recorded in public databases (National Center for Biotechnology Information, 2025). The human evidence is still at an early stage. PreviousΔ-3-Carene NextAlpha-Pinene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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Δ-3-Carene – PatientsCann UK Skip to main content Back to Terpenes Guide Δ-3-Carene Delta-3-Carene, 3-Carene pronounced: KAIR-een A sweet, piney, citrus scent from pine and cedar trees. Studied for calming and for excess fluid. Monoterpene Boiling point: 169°C Terpene type Monoterpene Boiling point 169°C Primary aroma Piney Key effect Calming Aroma profile How it Smells The aroma of Δ-3-Carene is described as: PineySweetCitrusCedarEarthy Found naturally in: Pine, cedar, rosemary, basil, bell pepper, cypress Effects Linked Effects CalmingBone supportDries excess fluid These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Δ-3-Carene? Delta-3-carene is a terpene with a sweet, piney smell and a hint of citrus and damp earth. It is found in pine and cedar trees, in rosemary and basil, and even in bell peppers. It is a light monoterpene, so its fresh, resinous scent lifts off quickly. In cannabis it adds to that classic forest-like smell that many people enjoy. Effects in detail What the Research Says In animal studies, delta-3-carene has shown a calming, sedative-like quality (Nuutinen, 2018). Researchers have also explored whether it may help dry up extra fluid in the body, and some early work has looked at its possible role in bone health. These are early laboratory findings. One thing to note is that, in large amounts, carene can be drying and may irritate the eyes or throat, which is why balance matters. Everyday sources Where You Find it in Daily Life You will find delta-3-carene in pine and cedar forests, in fresh rosemary and basil, in cypress, and in sweet bell peppers. Pine and cedarwood essential oils are rich in it. Its piney, woody smell makes it popular in cleaning products and air fresheners that aim for a fresh-forest scent. Research Key Studies The review by Nuutinen (2018) summarised the laboratory evidence on delta-3-carene, including its calming effect in animal tests and early interest in bone health. Its chemical make-up is listed in public databases (National Center for Biotechnology Information, 2025). As with other terpenes, careful human research is still needed. PreviousLimonene Nextα-Terpinene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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Valencene – PatientsCann UK Skip to main content Back to Terpenes Guide Valencene (+)-Valencene pronounced: VAL-en-seen Smells like sweet Valencia oranges. A larger terpene studied for easing swelling and protecting skin. Sesquiterpene Boiling point: 274°C Terpene type Sesquiterpene Boiling point 274°C Primary aroma Citrus Key effect Anti-inflammatory Aroma profile How it Smells The aroma of Valencene is described as: CitrusSweetOrangeFruityFresh Found naturally in: Valencia oranges, grapefruit and other citrus fruit Effects Linked Effects Anti-inflammatorySkin protectionInsect repellent These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Valencene? Valencene is named after the Valencia orange, the fruit it was first found in. It carries a sweet, juicy citrus smell and is the terpene behind much of the lovely aroma of fresh oranges and grapefruit. Unlike the lighter citrus terpenes, valencene is a sesquiterpene, which means it is a larger and heavier molecule. Its boiling point at normal pressure is high, around 274 degrees, although it is often measured at about 123 degrees under reduced pressure in the laboratory (National Center for Biotechnology Information, 2025). Effects in detail What the Research Says Early research has looked at valencene as an anti-inflammatory, meaning it may help calm swelling, and as a substance that could help protect skin from sun damage in laboratory tests (Nuutinen, 2018). It is also studied as a natural insect repellent. These uses are promising but early. Most of the evidence comes from cell and animal studies rather than trials in people. Everyday sources Where You Find it in Daily Life You meet valencene every time you peel a sweet orange or a grapefruit. It is concentrated in the oil of the peel, which is why citrus zest smells so strong and sweet. It is also used in the food and drink industry to add a natural orange flavour, and in some skincare products. Research Key Studies Reviews of plant and cannabis terpenes, including Nuutinen (2018), describe valencene mainly for its anti-inflammatory and skin-protecting activity seen in laboratory work. Its chemistry, including the way its boiling point changes with pressure, is recorded in public databases (National Center for Biotechnology Information, 2025). Human evidence is still limited. Previousγ-Terpinene NextLimonene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. National Center for Biotechnology Information (2025) PubChem Compound Database. Bethesda: U.S. National Library of Medicine. Available at: https://pubchem.ncbi.nlm.nih.gov (Accessed: 11 June 2026). Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Cicada Jersey (2020) Terpene Wheel. Available at: https://cicada.je/terpene-wheel/ (Accessed: 11 June 2026).

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Skip to main content Research Participation Can your photographs help change how people see medical cannabis patients? Researchers at Liverpool John Moores University (LJMU) want to hear from people in the UK who have a legal prescription for medical cannabis. By taking part, you can help show the world what life is really like as a prescribed patient. Study open now Takes around 1 hour Online, from home Fully confidential About the study The MedCan Project: Seeing Stigma — Liverpool John Moores University, 2025 Many people who use medical cannabis with a legal prescription still face unfair judgement from others. This can happen at work, in healthcare settings, or in everyday social life. The Seeing Stigma study wants to understand this experience from the inside, in your own words and through your own eyes. This study uses a method called Photovoice. You take photographs in your daily life, then share what those images mean to you. Your photographs become evidence. They help researchers, policymakers, and the public understand the reality of living as a prescribed medical cannabis patient in the UK. The research team has already taken patient stories to parliament. This is your chance to make your voice part of that conversation. What is Photovoice? Photovoice is a research method where you take photographs to tell your story. You do not need to be a photographer. You just need a mobile phone or camera and the ability to share a few images by email, along with a short note about what each photo means to you. There are no right or wrong answers. Who can take part? You are eligible if all three of the following apply to you. Aged 18 or over You must be an adult aged 18 or older to take part in this study. Living in the UK You must currently be living in the United Kingdom, including England, Scotland, Wales or Northern Ireland. Prescribed patient or carer You are currently prescribed medical cannabis by a doctor, or you are a carer for someone who is. Important: prescriptions only This particular study is about medical cannabis used with a legal UK prescription. It does not include recreational cannabis use. If you are unsure whether you qualify, you can register your interest and the research team will confirm your eligibility. What would I need to do? Taking part is straightforward and entirely on your own terms. 1 Register your interest Complete a short online form. This does not commit you to anything. The team will send you a full information pack. 2 Take photographs Using any camera or mobile phone, take photos that represent your life as a prescribed patient. No photography experience is needed. 3 Share by email Send your photographs to the research team along with a few words about what each image means to you. 4 Optional interview You may be invited to a short online conversation about your photographs. You can say no, or stop at any point. Your privacy and safety Your wellbeing and confidentiality come first throughout this study. Protections in place All responses are fully confidential You can withdraw at any time, with no reason needed No questions you are uncomfortable answering Photos will only be used as agreed with you Ethically approved by LJMU (Ref: 24/LCP/005) Your name will never appear in published work without your consent Ready to get involved? Register your interest now. Completing the form takes just a few minutes and commits you to nothing. The research team will send you the full participant information pack and answer any questions you have. Register your interest About the MedCan Project Lead researcher Dr Lindsey Metcalf McGrath Principal Investigator, School of Justice Studies, Liverpool John Moores University Dr Metcalf McGrath leads the MedCan Project at LJMU. Her team has previously carried patient research directly to parliament. You can contact her directly if you have any questions before deciding whether to take part. Ethics ref: 24/LCP/005 Conducted by Liverpool John Moores University Social: @MedCanProject LJMU central: 0151 231 2121 References Metcalf McGrath, L. and Liverpool John Moores University (2025) MedCan Project: Seeing Stigma — Participant Information Sheet. Liverpool: LJMU School of Justice Studies. Available at: https://ljmu.questionpro.eu/MedCanProjectSeeingStigma (Accessed: 2 June 2025). Liverpool John Moores University (2025) Medical Cannabis Project — Research Participation. Liverpool: LJMU. Available at: https://www.ljmu.ac.uk/research/research-participation/medical-cannabis (Accessed: 2 June 2025). Wang, C. and Burris, M.A. (1997) ‘Photovoice: Concept, methodology, and use for participatory needs assessment’, Health Education and Behavior, 24(3), pp. 369–387. doi: 10.1177/109019819702400309.

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A free letter template and step-by-step guide to ask your NHS Trust to adopt a medical cannabis inpatient policy.

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Ocimene – PatientsCann UK Skip to main content Back to Terpenes Guide Ocimene Beta-Ocimene, cis/trans-Ocimene pronounced: OH-sih-meen Sweet, tropical, and herbaceous. The lowest boiling point of the main terpenes. Monoterpene Boiling point: 50°C Terpene type Monoterpene Boiling point 50°C Primary aroma Sweet Key effect Uplifting Aroma profile How it Smells The aroma of ocimene is described as: SweetHerbaceousPerfumedCitrusTropical Found naturally in: Mint, parsley, orchids, mangoes, tarragon, basil Effects Linked Effects UpliftingEnergyAntiviralAntifungal These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Ocimene? Ocimene is a sweet, tropical terpene with a complex aroma that blends fresh herbs, citrus blossom, and a hint of fruit. Cannabis plants produce it partly as a natural defence against insects and pests. When a strain has a fresh, almost perfume-like quality to its smell, ocimene is often a significant contributor. It has the lowest boiling point of the main cannabis terpenes at around 50 degrees Celsius. This means it evaporates very quickly. Fresh or recently cured cannabis will have more ocimene aroma than older or poorly stored cannabis, where it will have largely evaporated. This is why it is most noticeable in very fresh flower (Booth and Bohlmann, 2019). Effects in detail What the Research Says Ocimene is associated with uplifting and energising effects, similar to limonene and terpinolene. It does not have as extensive a human evidence base as some other terpenes, but preclinical research has found antiviral, antifungal, and anti-inflammatory properties (Nuutinen, 2018). Its antiviral properties are of particular scientific interest. Studies have found that ocimene can inhibit the activity of certain viruses in cell cultures, though this is laboratory research and does not mean it treats viral infections in humans. LaVigne et al. (2021) found that it can modulate cannabinoid receptor activity, contributing to the entourage effect. Everyday sources Where You Find it in Daily Life Mint is one of the richer everyday sources of ocimene. The fresh, slightly sweet quality of mint that is distinct from its menthol sharpness comes partly from ocimene. Parsley, basil, and tarragon also contain it. Orchid flowers produce significant amounts of ocimene as a pollinator attractant. Mangoes contain a small but noticeable quantity, adding to their complex tropical aroma. Because it evaporates so easily, the best way to experience ocimene in everyday food is to eat fresh, uncooked herbs. Research Key Studies Nuutinen (2018) reviewed evidence for ocimene’s antifungal and anticonvulsant activity in preclinical models. The antifungal properties are consistent across several studies and suggest potential clinical applications for fungal skin conditions, though human trials are lacking. Weil (2022) notes that ocimene’s presence in a strain profile is often a marker for fresh, recently harvested cannabis because of its volatility. LaVigne et al. (2021) confirmed that ocimene participates in cannabinoid receptor modulation alongside other cannabis terpenes, providing another mechanism through which it may contribute to the overall experience of a strain. Previous Humulene Next Alpha-Bisabolol Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. LaVigne, J.E. et al. (2021) ‘Cannabis sativa terpenes are cannabimimetic and selectively enhance cannabinoid activity’, Scientific Reports, 11(1), 8232. doi: 10.1038/s41598-021-87740-8. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Weil, M. (2022) ‘Most common cannabis terpenes and what they do’, Cannigma. Available at: https://cannigma.com/plant/a-brief-history-of-terpenes/ (Accessed: 29 May 2026).

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Camphene – PatientsCann UK Skip to main content Back to Terpenes Guide Camphene 2,2-Dimethyl-3-methylenebicyclo[2.2.1]heptane pronounced: KAM-feen Smells like a damp fir forest. May support healthy cholesterol levels. Monoterpene Boiling point: 159°C Terpene type Monoterpene Boiling point 159°C Primary aroma Damp Earth Key effect Anti-inflammatory Aroma profile How it Smells The aroma of camphene is described as: Damp EarthFir NeedlesCamphorForest Floor Found naturally in: Cypress, rosemary, ginger, nutmeg, valerian, sage Effects Linked Effects Anti-inflammatoryPain reliefAntioxidantCardiovascular These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Camphene? Camphene has a distinctive, damp, earthy aroma with strong fir tree and camphor notes. If you have ever walked through a coniferous forest after rain and noticed that sharp, resinous, almost medicinal smell, camphene is a significant part of it. It is also the compound that gives old-fashioned camphor mothballs their smell. In cannabis, camphene is usually a minor terpene but contributes to the overall earthy, woody character of certain strains. It is a bicyclic monoterpene, meaning its carbon ring structure is folded, which gives it a more complex and persistent smell than simpler linear terpenes (Booth and Bohlmann, 2019). Effects in detail What the Research Says Camphene has a surprisingly diverse preclinical evidence base. Nuutinen (2018) reviewed studies suggesting it has antifungal, antioxidant, and anti-inflammatory properties. Perhaps most unusually among terpenes, there is also early evidence from animal studies that camphene may reduce blood triglycerides and LDL cholesterol. If confirmed in human trials, this cardiovascular effect would make camphene unique among the 12 terpenes profiled here. However, these are very early-stage findings and cannot be interpreted as evidence that cannabis products will improve cardiovascular health. Everyday sources Where You Find it in Daily Life Rosemary contains camphene alongside pinene and other terpenes, contributing to its sharp, medicinal character. Ginger and nutmeg both contain camphene, adding to their warm, slightly medicinal warmth. Valerian root, widely sold as a sleep supplement, contains camphene as one of several active aromatic compounds. This may partly explain why valerian is associated with relaxation, though its main sedative compounds are different. Cypress essential oil is one of the richest non-cannabis sources. Research Key Studies Nuutinen (2018) reviewed the available evidence and noted camphene’s potential as an antilipidaemic agent based on animal studies, alongside its antimicrobial and antioxidant properties. The review flagged this as an area warranting further investigation in human subjects. LaVigne et al. (2021) found that camphene, alongside other cannabis terpenes, can modulate cannabinoid receptor activity, placing it within the entourage effect framework. Booth and Bohlmann (2019) noted that camphene’s presence in a cannabis terpene profile is often associated with strains grown in cooler climates, where its biosynthesis is favoured. Previous Guaiol Next Myrcene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. LaVigne, J.E. et al. (2021) ‘Cannabis sativa terpenes are cannabimimetic and selectively enhance cannabinoid activity’, Scientific Reports, 11(1), 8232. doi: 10.1038/s41598-021-87740-8. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076.

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Guaiol – PatientsCann UK Skip to main content Back to Terpenes Guide Guaiol Champacol pronounced: GWHY-ol A rare woody terpene from guaiacum wood. Highest boiling point of the 12. Sesquiterpene Boiling point: 288°C Terpene type Sesquiterpene Boiling point 288°C Primary aroma Woody Pine Key effect Anti-inflammatory Aroma profile How it Smells The aroma of guaiol is described as: Woody PineCypressBalsamic EarthSandalwood Found naturally in: Guaiacum wood, cypress trees, lilac, pine Effects Linked Effects Anti-inflammatoryPain reliefAntibacterialAntioxidant These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Guaiol? Guaiol is a rare sesquiterpene alcohol with a deep, piney, and slightly rosy aroma reminiscent of sandalwood and cypress. It has the highest boiling point of the 12 terpenes covered here at 288 degrees Celsius, which means it evaporates last of all and contributes most strongly to the long-lasting woody base note of a strain. It takes its name from Guaiacum, a dense tropical hardwood tree from the Caribbean. Traditional medicine in that region has used guaiacum resin for centuries for conditions including arthritis. Guaiol is thought to be one of the active compounds responsible for these traditional uses (Nuutinen, 2018). Effects in detail What the Research Says Guaiol has been studied primarily for anti-inflammatory and antibacterial properties. Its high boiling point means it survives the heating process better than most other terpenes, which may make it particularly relevant for vaped or heated cannabis products where lower-boiling terpenes are lost. Nuutinen (2018) reviewed preclinical evidence for guaiol’s antimicrobial and insecticidal activity. It also appeared in the LaVigne et al. (2021) study as one of the sesquiterpenes capable of modulating cannabinoid receptor activity, contributing to the entourage effect. Everyday sources Where You Find it in Daily Life Guaiol is less common in everyday food than most other terpenes. It is found primarily in wood resins, cypress essential oil, and lilac. Pine needles contain a small amount. If you have ever smelled the inside of a freshly sawn hardwood log, the warm, resinous component of that smell likely contains guaiol. Some high-end perfumes use cypress essential oil as a base note, and guaiol is part of what gives cypress its distinctive, long-lasting woody character. It is also used in some traditional incense formulations. Research Key Studies Nuutinen (2018) identified guaiol as having notable antibacterial properties in vitro, along with antioxidant activity. The review noted that guaiol’s high boiling point makes it a candidate for study in heated cannabis preparations where other terpenes would already have evaporated. LaVigne et al. (2021) included guaiol among the sesquiterpenes found to selectively enhance cannabinoid activity. This confirms that even relatively minor terpenes in cannabis can play a pharmacologically meaningful role in the overall profile of a product. Previous Trans-Nerolidol Next Camphene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References LaVigne, J.E. et al. (2021) ‘Cannabis sativa terpenes are cannabimimetic and selectively enhance cannabinoid activity’, Scientific Reports, 11(1), 8232. doi: 10.1038/s41598-021-87740-8. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076.

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Trans-Nerolidol – PatientsCann UK Skip to main content Back to Terpenes Guide Trans-Nerolidol Peruviol, Penetrol pronounced: tranz neh-ROL-ih-dol A soft, woody-floral terpene. Found in jasmine and tea tree. Sesquiterpene Boiling point: 122°C Terpene type Sesquiterpene Boiling point 122°C Primary aroma Woody Key effect Sleep support Aroma profile How it Smells The aroma of trans-nerolidol is described as: WoodyRose-floralEarthy barkJasmineWaxy Found naturally in: Jasmine, tea tree, neroli, lemongrass, ginger Effects Linked Effects Sleep supportRelaxingCalmAntimicrobial These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Trans-Nerolidol? Trans-nerolidol has a complex, multi-layered scent that combines the woody warmth of bark with a soft, rose-like floral quality and a hint of jasmine. It is less common in cannabis than myrcene or linalool, but strains that contain it often have a particularly smooth, rounded aroma. It is found in jasmine, neroli (bitter orange blossom), and tea tree, and is used in the fragrance industry as a fixative: a compound that helps other scents last longer. In cannabis, it appears most often alongside myrcene and linalool in strains with a heavy, sedating character (Booth and Bohlmann, 2019). Effects in detail What the Research Says Nerolidol is most associated with sedative and sleep-supporting effects. It commonly appears in cannabis strains alongside myrcene and linalool, forming what some researchers describe as a sedating terpene triad. Nuutinen (2018) reviewed preclinical evidence for its sleep-promoting and anxiolytic properties. It also has notable antimicrobial and antiparasitic properties in laboratory studies. Research has found it effective against certain fungi and even against the malaria parasite in cell studies, though these are very early-stage findings with no clinical application at this time. LaVigne et al. (2021) confirmed cannabinoid receptor modulation. Everyday sources Where You Find it in Daily Life Jasmine tea and jasmine-scented products are the easiest way to encounter nerolidol in everyday life. The deep, slightly waxy floral quality of jasmine is partly due to this terpene. Ginger root also contains nerolidol alongside other aromatic compounds. Tea tree oil contains nerolidol as a minor but important component. Its presence in tea tree alongside other terpenes like terpinene contributes to the oil’s broad antimicrobial activity. Neroli essential oil, derived from bitter orange blossom, is named in part because nerolidol was first isolated from it. Research Key Studies Nuutinen (2018) reviewed nerolidol’s pharmacological profile, highlighting evidence for sedative, antiparasitic, antifungal, and antioxidant effects across multiple preclinical studies. The review noted that nerolidol’s skin penetration-enhancing properties make it relevant for topical cannabis formulations. LaVigne et al. (2021) found that nerolidol, alongside other sesquiterpenes, can selectively enhance cannabinoid activity, suggesting it plays a more active pharmacological role than simply contributing to aroma. Previous Alpha-Bisabolol Next Guaiol Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. LaVigne, J.E. et al. (2021) ‘Cannabis sativa terpenes are cannabimimetic and selectively enhance cannabinoid activity’, Scientific Reports, 11(1), 8232. doi: 10.1038/s41598-021-87740-8. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076.

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Alpha-Bisabolol – PatientsCann UK Skip to main content Back to Terpenes Guide Alpha-Bisabolol α-Bisabolol, Levomenol pronounced: AL-fuh bih-SAB-oh-lol The chamomile terpene. Used in skin creams for centuries. Sesquiterpene Boiling point: 153°C Terpene type Sesquiterpene Boiling point 153°C Primary aroma Floral Key effect Calm Aroma profile How it Smells The aroma of alpha-bisabolol is described as: FloralSweetChamomile-likeHoneyPowdery Found naturally in: Chamomile, candeia wood, sage, sweet grass Effects Linked Effects CalmAnti-inflammatoryRelaxingSkin soothing These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Alpha-Bisabolol? Alpha-bisabolol has a gentle, sweet, floral aroma that is immediately recognisable as chamomile. It is the main active terpene in chamomile essential oil and has been used in skincare for hundreds of years. In cannabis, it tends to appear as a secondary terpene, adding a soft, powdery floral note to strains that contain it. As a sesquiterpene, it is a larger and heavier molecule than monoterpenes. This means it does not evaporate as quickly and can have a more persistent effect when applied to skin or inhaled. It is also one of the terpenes found in the KAST batch data on this site, appearing in several of the CSC Cannacosta strains (Booth and Bohlmann, 2019). Effects in detail What the Research Says Alpha-bisabolol has one of the strongest track records among terpenes for skin-related applications. It reduces redness and irritation, helps other ingredients penetrate the skin more effectively, and has been found to have antimicrobial properties. This is why it appears in so many pharmaceutical creams and lotions. In cannabis, its contribution to the overall experience is likely related to its calming and anti-inflammatory effects. Nuutinen (2018) reviewed evidence for anxiolytic and anti-inflammatory activity. Baram et al. (2022) found that bisabolol activates endocannabinoid receptors, adding to the entourage effect. Everyday sources Where You Find it in Daily Life Chamomile tea is the most accessible everyday source. The calming effect that chamomile tea is famous for is partly due to bisabolol and related compounds in the plant. When you drink a cup before bed, you are consuming a small amount of this terpene. Candeia wood (Eremanthus erythropappus), a tree native to Brazil, contains the highest natural concentrations of alpha-bisabolol and has historically been over-harvested to supply the cosmetics industry. Most commercial bisabolol is now produced synthetically or from sustainably managed sources. Research Key Studies Nuutinen (2018) reviewed bisabolol’s pharmacological profile and noted evidence for anti-inflammatory, antimicrobial, and analgesic properties. The review also highlighted its role as a penetration enhancer, meaning it can help other therapeutic compounds cross biological barriers more effectively. Baram et al. (2022) confirmed endocannabinoid receptor activity for bisabolol at physiologically relevant concentrations. Francomano et al. (2025) included it in their review of terpenes contributing to the entourage effect in cannabis medicines, noting particular interest in topical cannabis formulations. Previous Ocimene Next Trans-Nerolidol Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Baram, L. et al. (2022) ‘Major cannabis terpenes, applied individually and in combination, activate endogenous cannabinoid CB1 and CB2 receptors’, Frontiers in Pharmacology, 13, 1040962. doi: 10.3389/fphar.2022.1040962. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. Francomano, F. et al. (2025) ‘The entourage effect in cannabis medicinal products: a comprehensive review’, Pharmaceuticals, 18(3), 378. doi: 10.3390/ph18030378. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076.

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Humulene – PatientsCann UK Skip to main content Back to Terpenes Guide Humulene α-Humulene, Alpha-Caryophyllene pronounced: HYOO-myoo-leen The hoppy terpene. Gives beer its herbal, earthy character. Sesquiterpene Boiling point: 107°C Terpene type Sesquiterpene Boiling point 107°C Primary aroma Hoppy Key effect Pain relief Aroma profile How it Smells The aroma of humulene is described as: HoppyEarthyWoodyHerbalBeer-like Found naturally in: Hops, sage, ginseng, coriander, basil Effects Linked Effects Pain reliefAnti-inflammatoryAppetite suppressantAntibacterial These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Humulene? Humulene is a sesquiterpene with a deep, earthy, and distinctly hoppy aroma. If you enjoy the smell of a good craft ale, you have experienced humulene. It is the dominant terpene in hops (Humulus lupulus), the plant used to flavour beer, and is found alongside beta-caryophyllene in many cannabis strains. It is sometimes called alpha-caryophyllene because the two molecules are closely related in structure. However, they have different shapes and slightly different aroma and pharmacological profiles. Humulene has a lower boiling point than caryophyllene, meaning it evaporates first when cannabis is heated (Nuutinen, 2018). Effects in detail What the Research Says Humulene has been studied primarily for anti-inflammatory and antibacterial properties. Nuutinen (2018) reviewed evidence showing that it can reduce inflammatory markers in cell studies. It is also one of the few terpenes associated with appetite suppression rather than stimulation, which makes it distinct from myrcene. Its anti-inflammatory effects may work alongside beta-caryophyllene when both are present in a strain, as the two terpenes share similar mechanisms through the endocannabinoid system. This interaction is an example of the entourage effect described by Russo (2011). Everyday sources Where You Find it in Daily Life Beer is the most obvious everyday source. Hoppy beers, particularly India Pale Ales and pale ales, contain the highest concentrations of humulene. The sharp, herbal bitterness of a hop-forward beer comes largely from this terpene. Sage and ginseng are notable non-hop sources. Traditional herbal medicine has used both of these plants for centuries, and researchers are now beginning to investigate whether humulene plays a role in their therapeutic effects. Coriander and basil also contain it in smaller amounts. Research Key Studies Nuutinen (2018) provided a comprehensive review of humulene’s pharmacological properties, noting significant evidence for anti-inflammatory, analgesic, and antibacterial activity in preclinical models. The review highlighted the potential for humulene to work synergistically with cannabinoids. Francomano et al. (2025) included humulene in their review of terpenes contributing to the entourage effect, noting that its combination with beta-caryophyllene in cannabis products may provide enhanced anti-inflammatory activity compared to either compound alone. Previous Terpinolene Next Ocimene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Francomano, F. et al. (2025) ‘The entourage effect in cannabis medicinal products: a comprehensive review’, Pharmaceuticals, 18(3), 378. doi: 10.3390/ph18030378. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x.

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Terpinolene – PatientsCann UK Skip to main content Back to Terpenes Guide Terpinolene Delta-Terpinene pronounced: ter-PIN-oh-leen A rare, multi-layered scent. Piney, floral, and citrus all at once. Monoterpene Boiling point: 184°C Terpene type Monoterpene Boiling point 184°C Primary aroma Woody Key effect Uplifting Aroma profile How it Smells The aroma of terpinolene is described as: WoodyPineyHerbalCitrus Blossom Found naturally in: Apples, lilac, limes, nutmeg, tea tree, cumin Effects Linked Effects UpliftingFocusEnergyAntioxidant These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Terpinolene? Terpinolene is one of the more unusual cannabis terpenes because it does not smell like just one thing. It has a complex, multi-layered aroma that mixes pine and wood with a hint of fresh flowers and citrus blossom. People often describe it as smelling like a spring garden. It is less common than myrcene or limonene and tends to appear as a dominant terpene only in certain sativa-leaning strains. When it is the dominant terpene in a strain, that strain usually has a distinctly fresh, bright character (Booth and Bohlmann, 2019). Effects in detail What the Research Says Terpinolene is most often associated with uplifting and energising effects. Unlike myrcene, which tends toward sedation, strains dominant in terpinolene are more likely to feel activating and mentally clarifying. Some users report improved focus and creativity. Nuutinen (2018) reviewed evidence for terpinolene’s antioxidant and possible anticancer properties in preclinical settings. It has also been found to have mild sedative effects in some animal studies at higher doses, which shows that the same terpene can have different effects depending on dose and context. Everyday sources Where You Find it in Daily Life Terpinolene is found in apples, giving them part of their fresh, slightly floral scent. Lilac flowers are particularly rich in it, as is nutmeg. Tea tree oil contains significant amounts of terpinolene, contributing to its sharp, medicinal smell. Limes contain more terpinolene than lemons, which partly explains why limes have a slightly more complex scent than lemons despite both being citrus fruits. Cumin seeds also contain it, alongside other spicy terpenes. Research Key Studies Nuutinen (2018) identified terpinolene as having notable antioxidant activity in cell studies, and noted potential antiproliferative effects in cancer cell lines in vitro. These findings are very early-stage and cannot be interpreted as evidence of a treatment or cure. The available evidence base for terpinolene is smaller than for myrcene or linalool. Weil (2022) highlights it as a terpene worthy of further investigation given its prevalence in certain strain profiles and its distinctive psychoactive character. LaVigne et al. (2021) found that terpinolene, like other cannabis terpenes, can modulate cannabinoid receptor activity. Previous Linalool Next Humulene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. LaVigne, J.E. et al. (2021) ‘Cannabis sativa terpenes are cannabimimetic and selectively enhance cannabinoid activity’, Scientific Reports, 11(1), 8232. doi: 10.1038/s41598-021-87740-8. Nuutinen, T. (2018) ‘Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus’, European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076. Weil, M. (2022) ‘Most common cannabis terpenes and what they do’, Cannigma. Available at: https://cannigma.com/plant/a-brief-history-of-terpenes/ (Accessed: 29 May 2026).

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Linalool – PatientsCann UK Skip to main content Back to Terpenes Guide Linalool Linalool alcohol pronounced: lin-AL-oh-ol The calming lavender terpene. Found in over 200 plant species. Monoterpene Boiling point: 198°C Terpene type Monoterpene Boiling point 198°C Primary aroma Floral Key effect Calm Aroma profile How it Smells The aroma of linalool is described as: FloralLavenderSweet HerbSage Found naturally in: Lavender, mint, coriander, rosewood, jasmine Effects Linked Effects CalmSleep supportRelaxingAnti-anxiety These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Linalool? Linalool is the terpene responsible for lavender’s famous calming scent. It is one of the most widely distributed terpenes in nature, appearing in over 200 different plants including mint, coriander, and many trees. When a cannabis strain has a soft, floral, slightly soapy smell, linalool is usually the reason. Unlike some terpenes that are present only in small amounts, linalool can be a major component in certain cannabis strains. It is a monoterpene alcohol, which gives it a slightly heavier, more complex character than simpler terpenes like limonene (Booth and Bohlmann, 2019). Effects in detail What the Research Says Linalool has one of the strongest bodies of evidence among cannabis terpenes for calming and sleep-supporting effects. Weston-Green et al. (2021) reviewed studies showing that inhaled linalool can reduce anxiety-like behaviour in animals, and that it appears to enhance the activity of GABA, a brain chemical that promotes relaxation and sleep. Abstrax Tech (2023) conducted studies with Western Washington University finding that a combination of linalool and myrcene produced notable anxiolytic (anti-anxiety) effects. Baram et al. (2022) confirmed that linalool activates CB1 and CB2 receptors, adding to its known mechanisms of action. Everyday sources Where You Find it in Daily Life Lavender is the most obvious everyday source. Lavender oil, widely sold in pharmacies and health shops, is mostly linalool. It is the active ingredient that makes lavender pillows and sleep sprays effective for some people. Coriander seeds contain high amounts too, which contributes to their floral, slightly soapy flavour. Linalool is one of the most commonly used fragrance ingredients in the world. It is found in many shampoos, soaps, and cosmetics, as well as in some foods as a natural flavouring. It is generally considered safe at typical exposure levels. Research Key Studies Weston-Green et al. (2021) specifically reviewed linalool alongside alpha-pinene as a potential medicine for brain health. They found preclinical evidence for anti-anxiety, antidepressant, anticonvulsant, and neuroprotective effects. The authors noted that the evidence base is growing but human clinical trials are still limited. Abstrax Tech (2023) reported collaborative research demonstrating anxiolytic synergy between linalool and myrcene, suggesting that terpene combinations may be more powerful than individual compounds. This supports the broader entourage effect framework described by Russo (2011). Previous Beta-Caryophyllene Next Terpinolene Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Abstrax Tech (2023) Linalool and beta-myrcene anxiolytic study with Western Washington University. Available at: https://abstraxtech.com/pages/terpene-research (Accessed: 29 May 2026). Baram, L. et al. (2022) ‘Major cannabis terpenes, applied individually and in combination, activate endogenous cannabinoid CB1 and CB2 receptors’, Frontiers in Pharmacology, 13, 1040962. doi: 10.3389/fphar.2022.1040962. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x. Weston-Green, K. et al. (2021) ‘A review of the potential use of pinene and linalool as terpene-based medicines for brain health’, Frontiers in Psychiatry, 12, 583211. doi: 10.3389/fpsyt.2021.583211.

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Beta-Caryophyllene – PatientsCann UK Skip to main content Back to Terpenes Guide Beta-Caryophyllene β-Caryophyllene (BCP) pronounced: BAY-tuh kair-ee-oh-FIL-een The only terpene that acts like a cannabinoid. Activates CB2 receptors directly. Sesquiterpene Boiling point: 130°C Terpene type Sesquiterpene Boiling point 130°C Primary aroma Spicy Key effect Pain relief Aroma profile How it Smells The aroma of beta-caryophyllene is described as: SpicyPepperyWoodyWarm Clove Found naturally in: Black pepper, cloves, cinnamon, oregano, copaiba Effects Linked Effects Pain reliefAnti-inflammatoryCalmNeuroprotective These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information. About What is Beta-Caryophyllene? Beta-caryophyllene is unique among terpenes. While most terpenes add to the cannabis experience through aroma and indirect effects, beta-caryophyllene can directly activate a receptor in the body called CB2. This is the same type of receptor that CBD works on. Because of this, some scientists classify it as a dietary cannabinoid as well as a terpene (Hashiesh et al., 2021). It is a sesquiterpene, meaning it is a larger molecule than monoterpenes like myrcene or limonene. This makes it less volatile and it tends to linger in the smell of a strain longer. Its aroma is immediately recognisable: the sharp, spicy heat of freshly ground black pepper (Booth and Bohlmann, 2019). Effects in detail What the Research Says Because beta-caryophyllene binds to CB2 receptors, it can influence inflammation and immune responses. CB2 receptors are found mainly outside the brain, particularly in immune cells, which means BCP can affect inflammation without causing psychoactive effects (Hashiesh et al., 2021). Preclinical studies have found potential benefits for pain relief, anxiety reduction, and even neuroprotection. Russo (2011) identified it as one of the most clinically interesting terpenes precisely because of its direct receptor activity. Research is ongoing into its potential for conditions involving chronic pain and inflammation. Everyday sources Where You Find it in Daily Life Black pepper is the richest everyday source. When you smell a pepper grinder, the spicy, slightly woody warmth is beta-caryophyllene. Cloves and cinnamon also contain high amounts, and it is a significant component of oregano, basil, and rosemary. Copaiba oil, used in traditional Amazonian medicine and now sold as a wellness supplement, contains very high concentrations of beta-caryophyllene. Some researchers studying copaiba’s anti-inflammatory properties believe BCP is the active ingredient responsible for its effects. Research Key Studies The landmark paper that established beta-caryophyllene as a CB2 agonist was published by Gertsch et al. (2008), though it is cited through Hashiesh et al. (2021) in this guide’s scope. Hashiesh and colleagues reviewed the broad pharmacological evidence and concluded that BCP has significant therapeutic potential for inflammatory and neuropathic conditions. Baram et al. (2022) confirmed that BCP activates CB2 at concentrations found in cannabis products, strengthening the case for its clinical relevance. Its non-psychoactive nature makes it particularly interesting as a potential therapeutic target. Previous Alpha-Pinene Next Linalool Back to full Terpenes Guide Important: The information on this page is for education only. It is not medical advice. Terpene research is still in its early stages. Many studies have been done in animals, not yet in people. Always speak to your doctor before changing your treatment. PatientsCann UK does not recommend any specific cannabis product. References Baram, L. et al. (2022) ‘Major cannabis terpenes, applied individually and in combination, activate endogenous cannabinoid CB1 and CB2 receptors’, Frontiers in Pharmacology, 13, 1040962. doi: 10.3389/fphar.2022.1040962. Booth, J.K. and Bohlmann, J. (2019) ‘Terpenes in Cannabis sativa: from plant genome to humans’, Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022. Hashiesh, H.S. et al. (2021) ‘A focused review on CB2 receptor-selective pharmacological properties and therapeutic potential of beta-caryophyllene’, Biomedicine and Pharmacotherapy, 140, 111639. doi: 10.1016/j.biopha.2021.111639. Russo, E.B. (2011) ‘Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects’, British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x.

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Devon Partnership NHS Trust has formally approved CD21, a Standard Operating Procedure that gives medical cannabis patients a clear, safe pathway to continue their lawful prescriptions while admitted to hospital. Here is what it means for you.

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