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Why a Medical Cannabis Not-for-Profit Started a Motorsports Team | PatientsCann UK® Skip to content Founder’s story Medical cannabis & motorsport Driving Out Cannabis Stigma Why a Medical Cannabis Not-for-Profit Started a Motorsports Team Before I knew medical cannabis was legal in the UK, motorsport was already my life. By Sal Aziz PatientsCann UK® Motorsports Team Founder’s story Team launch · Thruxton On this page Getting through the gate Becoming a patient When my case became policy Finding another route Why I have to race References One of my earliest racing memories is being told off for swearing after losing on Need for Speed: Underground. In my defence, I was only replicating my father! A few years later, he introduced me to Formula 1 after Lewis Hamilton joined the grid. I began watching properly in 2008 and was immediately hooked, waking at the crack of dawn when needed to see every race live. The highlight was Brazil 2008. My father walked out during the final lap, believing the championship was over, moments before Martin Brundle exclaimed: “Is that Glock?!” I had to scream for him to come back. I wanted to be part of that world, but racing appeared impossibly expensive. Even arrive-and-drive karting was beyond my budget. Then I discovered marshalling. Getting in Getting Through the Gate In 2021, I attended American SpeedFest at Brands Hatch. COVID restrictions meant unusually small crowds, giving the freedom to explore. Watching the marshals made me realise there was no reason I could not join them. I volunteered and was immediately hooked. Driving onto a circuit for the first time, even at 30 mph to reach my post, felt momentous. I was finally part of motorsport rather than watching from behind a screen or spectator fence. I went on to marshal events ranging from grassroots racing at Anglesey to the British Touring Car Championship and Goodwood Festival of Speed. I can even add “told Gordon Ramsay where to park at Goodwood” to my CV. Sal marshalling at Goodwood, as seen on Sky Sports F1. (Image source: Sky UK, used for illustrative purposes under Fair Dealing). “Told Gordon Ramsay where to park at Goodwood.” (Image source: Sky UK, used for illustrative purposes under Fair Dealing). I also competed in car trials, taking my Daewoo Lacetti off-road to see how far it could travel through marked sections. It was not Formula 1, but it was affordable, competitive and enormous fun. Author competing in a car trial (Image source: Woolbridge Motor Club, used for illustrative purposes under Fair Dealing). Treatment Becoming a Patient After a road trip through the Netherlands and an eventual drug-driving investigation in which I was found to be below the applicable limit, despite testing a wide range of cannabis products, I began exploring medical cannabis through the proper clinical route. My initial consultation took place on a Saturday morning at Silverstone before a day of marshalling. Once I began treatment, I noticed immediate improvements. Chief marshals commented positively on my performance. I completed the required health declarations and passed my flag assessment while openly prescribed medical cannabis. Author flag marshalling at the NASCAR Whelen Euro Series (Image source: GP1, used for illustrative purposes under Fair Dealing). Flag marshalling requires concentration, communication and rapid decisions in a safety-critical environment. I performed that role successfully and was excited to return to Goodwood for a second year, this time in the Supercar Paddock. Then a member of the public reported a marshal using cannabis. The report The Report That Began With a Smell I immediately acknowledged that the cannabis was mine and explained that it was legally prescribed for anxiety. I expected that explanation to resolve the concern. Instead, I was removed from post while senior Motorsport UK personnel were contacted. I was eventually permitted to continue in the lower-risk Supercar Paddock while the matter was reviewed. No performance failure or near miss had prompted the intervention. My medicine had become visible because of its smell. An odourless tablet may remain private. Cannabis flower can announce a patient’s treatment before they choose to discuss it. Smell is not evidence of impairment, but it can activate assumptions inherited from cannabis prohibition. That report eventually became much bigger than my individual case. Policy When My Case Became Policy In February 2024, Motorsport UK introduced Version 1 of a new signing-on declaration. It asked officials and marshals to confirm that they did not have disabilities or mental-health conditions, use drugs on the WADA Prohibited List, or take medication that might affect their duties. Motorsport UK later explained that the change followed reports during 2023 involving physical capability, mental health and the “substance use of colleagues”. I recognised myself in two parts of that explanation. Anxiety was my declared mental-health condition. Prescribed cannabis was my treatment, but it was apparently being framed as “substance use”. Although I was not named, the description reflected the defining features of my case. Version 1 of the officials declaration. Version 1 backfired horribly. Disabled volunteers and marshals taking medicines including blood thinners and asthma treatments began questioning whether they were still eligible. Medical cannabis was also independently identified as a problem. Within days, Motorsport UK issued Version 2, returning to a more sensible functional question: did the person’s condition or treatment adversely affect their duties? Version 2 of the officials declaration. But medical cannabis remained explicitly prohibited. My interpretation is that Version 1 attempted to capture cannabis through broad language about mental health, medication, “substance use” and the WADA list without initially announcing a cannabis-specific ban. When that language affected too many other volunteers, it was reversed, but cannabis patients remained excluded. I cannot prove the private intentions of those who wrote the policy. What I can say is that my case was followed by Version 1, the backlash, Version 2 and ultimately a categorical medical cannabis prohibition. Motorsport UK Public UK Licence Suspensions Register. Responsibility The Ban Is Not My Fault, but It Followed My Case I did not ban medical

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Race Report: Thruxton Retro, 4 July 2026 | PatientsCann UK® Skip to content Race report Thruxton Retro Team launch Race Report: Thruxton Retro, 4 July 2026 The PatientsCann UK® Motorsport Team successfully launched at Thruxton Retro on 4 July 2026, with founder Sal Aziz completing 15 drag-racing runs in his Vauxhall Insignia estate. By PatientsCann UK® Motorsports Team Race report Thruxton, 4 July 2026 15 runs completed On this page Preparing the car Arrival at Thruxton A green light Racing through the middle Fifteen runs Just the beginning References After securing a NORA Motorsport licence with his medical cannabis prescription declared, Sal immediately began looking for an opportunity to return to competitive motorsport. Thruxton was the natural choice. It was the circuit where Sal had first entered motorsport as a marshal, making it the perfect place to relaunch his motorsport career from behind the wheel. The build Preparing an Unlikely Race Car Preparation for the event was suitably grassroots. Sal crudely applied a cannabis-themed livery to his Vauxhall Insignia estate before we posted a teaser on social media. Despite the appearance, we were generating attention before the car had even reached the start line. The teaser: a cannabis-themed livery applied to the Vauxhall Insignia estate. Livery detail: a sports team for cannabis patients. The Insignia was not built for drag racing. It is a diesel estate, complete with a roof box, rather than one of the specially prepared machines normally associated with the drag strip. The team knew the Insignia was unlikely to be competitive against dedicated racing machinery. The first objective was simply to take part. A diesel estate with a roof box in the paddock, among purpose-built machinery. Race day Arrival at Thruxton Sal drove to Thruxton feeling the familiar mixture of excitement and nerves that accompanies any motorsport event. This time, however, those emotions were amplified by everything he had experienced in the sport. This was more than his first drag-racing event. It was his return to competitive motorsport as an openly prescribed medical cannabis patient. It was also the public launch of a team created to challenge the stigma and exclusion patients continue to experience. On arrival, event staff were understandably surprised to discover that the Vauxhall Insignia estate with a roof box was there to race. But one of the attractions of a Run What You Brung event is contained in the name: almost anything can be raced. Sal was directed to Thruxton’s runway, which had been transformed into a drag strip for the event. After signing on, the Insignia passed scrutineering and was cleared to take part. The unlikely race car was ready. Thruxton’s runway, transformed into a drag strip for the event. Launch A Green Light for the Team Sal drove into the staging area and joined the queue alongside a remarkable mixture of machinery. The entry included purpose-built drag cars, powerful performance vehicles, modified classics and ordinary road cars. As he moved towards the front of the queue and began staging at the lights, the significance of the moment finally sank in. To an observer, it may have looked like somebody preparing to drive an estate car quickly down a straight runway. To Sal and PatientsCann UK®, it represented something far greater. A medical cannabis patient who had been excluded from one pathway into motorsport had found another. He had declared his prescription, obtained a licence, passed scrutineering and reached the start line through the relevant processes. The lights changed. Sal accelerated down Thruxton’s runway. With that first green light, the PatientsCann UK® Motorsport Team was officially launched. Staging at the lights on Thruxton’s runway. The PatientsCann UK® Motorsports Team launch at Thruxton Retro. Symbolism Racing Through the Middle The location made the moment especially symbolic. Thruxton’s runway sits inside the main circuit. While Sal completed his runs under the NORA and Straightliners framework, Motorsport UK-regulated activity was taking place on the circuit around him. He was literally racing in the middle of the motorsport environment from which prescribed medical cannabis patients had been excluded under a different governing system. Same patient. Same prescription. Same condition. Different governance. PatientsCann UK® Motorsport Team The contrast demonstrated why PatientsCann UK® believes that transparent, evidence-based participation processes are possible. Safety remains essential, but automatic exclusion is not the only way in which a governing body can respond to legally prescribed medication. The results Fifteen Completed Runs 15 Completed runs 11.07s Best time 64mph Top terminal speed Once the first-run nerves had settled, Sal returned to the staging lanes repeatedly throughout the day. He raced against everything from specialist drag machinery to conventional road cars. Unsurprisingly, the diesel estate was not troubling the fastest competitors, but outright performance was never the primary objective. The official results record 15 completed runs. Sal’s best time was 11.07 seconds, with his runs generally finishing at between 61 and 64 mph. His highest recorded terminal speed was 64 mph. More importantly, Sal participated consistently throughout the event while managing and using his legally prescribed medication. One event cannot establish that every medical cannabis patient is suitable for every motorsport role. Patients, roles and circumstances differ. However, the day demonstrated that a prescribed patient could disclose their medication, follow a governing body’s process and participate repeatedly in a live motorsport environment. One of 15 completed runs down Thruxton’s runway. Perspective More Than a Result There were no trophies for the PatientsCann UK® Motorsport Team at Thruxton Retro, and the Insignia estate did not suddenly become a thoroughbred drag car. The achievement was reaching the start line at all. Each completed run made medical cannabis patients visible within motorsport for the right reasons: participating openly, following the rules and contributing to the event alongside everyone else. The day also showed what accessible motorsport can look like. Sal did not arrive with a purpose-built car, a professional crew or a huge racing budget. He arrived in his everyday Vauxhall estate with a homemade livery and a roof box. And he raced it.

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Medical cannabis clinics refusing psychiatric patients | PatientsCann UK Skip to content News & Analysis Patient Rights Your Voice Counts Left in the dark: are private cannabis clinics turning their backs on psychiatric patients? Since a landmark coroner’s finding and the launch of Oliver’s Law, some private clinics appear to have swung from open doors to closed ones. We are hearing from patients who have been refused, discharged or flagged, often without a clear reason or a chance to reply. Here is what is happening, why it matters, and exactly what you can do. PatientsCann UK News & Advocacy Updated 10 August 2026 On this page What is happening Oliver’s story Our position Curaleaf responds Unmet need The cost Business reality A patient’s story What you can do SAR guide Share your experience References Please read gently This article touches on mental illness and, briefly, on the loss of a life. It is written with care, but please read at your own pace and step away if you need to. If you are struggling or in crisis, you are not alone: you can call the Samaritans free, day or night, on 116 123, or text SHOUT to 85258. This page is general information and support, not legal or medical advice. So you can read at your own pace, the most sensitive wording is hidden by default. Use the button to show it all, or tap any hidden word to reveal just that part. Show sensitive wording Why this matters A pattern, not one clinic Patients across several clinics report sudden refusals and discharges tied to mental health history. Safety and fairness Safe prescribing matters. So does the right to an individual assessment, accurate records and a fair review. You have rights You can see your records, correct mistakes and be heard. This page shows you how, step by step. The shift From open doors to closed ones For years, private medical cannabis clinics built their reputations on access and care. They advertised low barriers to entry and a compassionate approach to conditions the NHS often struggles to manage. For many patients, that promise was real, and life-changing. Recent months tell a more worrying story. Following greater regulatory pressure and a coroner’s report about prescribing safety, some clinics appear to have moved into a defensive crouch. Rather than working with patients to deliver safe, individual care, a number seem to be quietly closing the door on people with a mental health history, sometimes the very people who were welcomed a year or two ago. We want to be clear and fair. Some caution is understandable, and safe prescribing is not optional. But caution should mean better assessment, not blanket exclusion. When a clinic refuses or discharges someone without a proper look at their situation, and without a chance to reply, that is not safety. That is a patient being left in the dark. A pattern reported across the community This is not about a single clinic. Patients sharing their experiences on platforms such as Reddit and Facebook describe a wider trend, and while every case is different, the themes are strikingly consistent. These are patients’ own accounts, not statements from the clinics. Three concerns come up again and again: Screening at the door Some applicants say that declaring a mental health condition now brings a high chance of rejection, particularly for new patients. Misread records Others report being turned down over old or miscategorised GP notes, then having to file a Subject Access Request and wait weeks just to prove the notes were wrong. Lost continuity Some long-term patients say they have suddenly lost access to a settled prescription, leaving them without the continuity of care they relied on. Clinics patients have raised similar concerns about Curaleaf Medicann Mamedica Integro Patients have described experiences like these with the clinics listed above on public platforms such as Reddit and Facebook. These are patients’ own accounts rather than statements from the clinics, individual circumstances vary, and this list reflects what we have seen so far. We contacted each clinic named here and invited them to respond to the concerns raised in this article. None of them replied by the time we published, and we will gladly add or update their responses if they get in touch. In fairness, Curaleaf Clinic has separately issued a formal response in Oliver’s case, a public letter to the coroner rather than a reply to us, which we set out in what Curaleaf says. If your experience involves another clinic, please tell us using the form below. Share your experience If this has happened to you, please know it is not a reflection of your worth as a patient or a person. A refusal is a decision about a process, and processes can be questioned, corrected and appealed. The background Oliver’s story, and why clinics are reacting To understand the change, it helps to understand what came before it. Much of the current caution traces back to one deeply sad case, and to the campaign his family began in his memory. Oliver Robinson was 34. He lived with recurrent depression and a diagnosed dependency on cannabis. What happened to Oliver, and the inquest that followed, led to the first finding of its kind in the UK. We share the timeline below with care and respect for his family. Apr 2022 A prescription after one video call After a single video consultation, Oliver was prescribed high-strength medical cannabis for depression. Reports state the clinic relied on GP records printed around nine months earlier and did not contact his other treating psychiatrists first. Curaleaf disputes parts of this account and says the decision was approved by a multidisciplinary team; see what Curaleaf says. 2022-23 His health declined Over around 18 months his mental health grew more fragile. His healthcare professionals and family saw the cannabis as an obstacle to his recovery, and the prescription was seen to reinforce a dependency rather than easing it. Nov 2023 Losing Oliver On

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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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