THCV (tetrahydrocannabivarin) is a minor cannabinoid whose structure is almost identical to THC, except for a shorter, three-carbon side chain. That small difference changes how it acts: at low doses THCV blocks the CB1 receptor that THC activates, and early human studies found no high at doses where THC causes one. Research on THCV is still at an early stage.
Key facts
- Full name
- Delta-9-tetrahydrocannabivarin (Δ9-THCV)
- Structure
- Like THC, but with a propyl (three-carbon) side chain instead of a pentyl (five-carbon) chain
- In the plant
- Made as the acid THCVA, from varinolic acid; first identified as a constituent of hashish
- Receptors
- CB1 antagonist at low doses, CB1 agonist at higher doses in animals; CB2 partial agonist
- Intoxicating?
- Early human studies: no intoxication at oral doses where THC causes it. Higher doses are less studied.
- UK status
- As of October 2026, the Misuse of Drugs Act 1971 controls THC homologues with side chains other than pentyl as Class B; THCV falls under this wording
What is THCV (tetrahydrocannabivarin)?
THCV is one of the "varin" cannabinoids, a group with a three-carbon side chain instead of the usual five. Other members are CBDV, CBV and CBCV. In the plant, the varins start from a different building block: THCV's acid form, THCVA, originates from varinolic acid, while THC comes from olivetolic acid (Haghdoost et al., 2025).
THCV is usually present in much smaller amounts than THC or CBD. As with THC, heat turns the acid form THCVA into THCV. Our guide to minor cannabinoids covers the wider group.
Prefer watching? This video covers the basics:
How is the THCV structure similar to THC?
The ring system of THCV is the same as that of THC. The only difference is the side chain on the right of the molecule: THC has five carbon atoms there, THCV three. Despite this similarity, researchers stress that THCV is neither a THC nor a THC isomer, and that its pharmacology is distinct (Haghdoost et al., 2025).
THCV vs THC: what is the difference?
| THCV | THC | |
|---|---|---|
| Side chain | Propyl (3 carbons) | Pentyl (5 carbons) |
| Plant precursor | Varinolic acid, via THCVA | Olivetolic acid, via THCA |
| CB1 receptor | Antagonist at low doses; agonist at higher doses in animals | Partial agonist |
| CB2 receptor | Potent partial agonist (in vitro) | Partial agonist |
| Intoxicating | Not at the oral doses studied so far | Yes |
| Amount in typical cannabis | Small | Main cannabinoid of drug-type cannabis |
The receptor behaviour is the key. THC causes its high by activating CB1 receptors in the brain. A classic review describes THCV as blocking CB1 activation in tissue studies, and acting either as a CB1 antagonist or, at higher doses, as a CB1 agonist in animals (Pertwee, 2008). Early human studies found that low oral doses of THC caused intoxication, while similar doses of THCV did not. The same authors caution that weak CB1 activity at high doses means intoxication at higher doses can't be ruled out (Haghdoost et al., 2025).
What does research say about THCV?
THCV has gained attention as "diet weed" in North America, a nickname based on animal studies of appetite and blood sugar. Reviews point out that there are few human studies of these effects (Haghdoost et al., 2025).
- Pilot trial in people: 62 adults with type 2 diabetes took CBD, THCV, combinations of the two or a placebo for 13 weeks. Compared with placebo, THCV lowered fasting blood glucose. No combination effect between CBD and THCV was found (Jadoon et al., 2016). It was a small pilot study.
- Animal and cell studies: a 2025 review summarises preclinical work on appetite, insulin sensitivity and fat metabolism, and calls human trials "preliminary" (Mendoza, 2025).
These studies used pure THCV in research settings. They do not apply to hemp products or to the small amounts of THCV in a plant extract.
Is THCV legal in the UK?
The Misuse of Drugs Act 1971 controls "cannabinol derivatives" as Class B drugs. According to the ACMD, this generic wording covers tetrahydro derivatives of cannabinol and their 3-alkyl homologues, meaning THC variants with side chains other than pentyl, such as THCH (hexyl) and THCB (butyl) (ACMD, 2025). THCV has a propyl side chain, so it falls under the same wording. Like THC, it is only exempt when it is contained in cannabis or cannabis resin, which are controlled in their own right.
How is THCV produced?
Because most cannabis contains little THCV, producers either breed plants with higher levels or isolate it from extracts by chromatography. A related compound, delta-8-THCV, has not been reported in cannabis plants and appears to be made semi-synthetically from CBDV (Haghdoost et al., 2025).
Frequently asked questions
What is THCV (tetrahydrocannabivarin)?
THCV is a minor cannabinoid with the same ring structure as THC but a shorter, three-carbon side chain. It is usually present in cannabis in small amounts.
What is the difference between THCV and THC?
THCV has a three-carbon side chain where THC has five. At low doses THCV blocks the CB1 receptor that THC activates, and early human studies found no high at doses where THC causes one.
Does THCV get you high?
Not at the oral doses studied so far. In animals, THCV can activate CB1 at higher doses, so researchers can't rule out effects at high doses.
Why is THCV called "diet weed"?
The nickname comes from animal studies on appetite and blood sugar. There are few human studies, and none shows that THCV in a cannabis or hemp product has these effects.
Is THCV legal in the UK?
The Misuse of Drugs Act 1971 controls THC variants with side chains other than pentyl as Class B drugs, and THCV's propyl side chain falls under that wording.
Is THCV the same as CBV?
No. CBV (cannabivarin) is the varin form of CBN and forms when THCV breaks down, much as CBN forms from THC.
Related guides
Formula Swiss CBD oils are sold as cosmetics for use on the skin. They are not food supplements or medicines and are not intended to diagnose, treat, cure or prevent any disease. The studies in this article gave cannabinoids by mouth in research settings. This article is general information and doesn't replace advice from your doctor or pharmacist.
Last reviewed:
Sources
- Haghdoost M, et al. Tetrahydrocannabivarin is not tetrahydrocannabinol. Cannabis and Cannabinoid Research 2025. doi:10.1089/can.2024.0051
- Pertwee RG. The diverse CB1 and CB2 receptor pharmacology of three plant cannabinoids: delta9-tetrahydrocannabinol, cannabidiol and delta9-tetrahydrocannabivarin. British Journal of Pharmacology 2008. doi:10.1038/sj.bjp.0707442
- Jadoon KA, et al. Efficacy and safety of cannabidiol and tetrahydrocannabivarin on glycemic and lipid parameters in patients with type 2 diabetes: a randomized, double-blind, placebo-controlled, parallel group pilot study. Diabetes Care 2016. doi:10.2337/dc16-0650
- Mendoza S. The role of tetrahydrocannabivarin (THCV) in metabolic disorders: a promising cannabinoid for diabetes and weight management. AIMS Neuroscience 2025. doi:10.3934/neuroscience.2025003
- Advisory Council on the Misuse of Drugs (ACMD). Semi-synthetic cannabinoids: cannabinoids related to tetrahydro-cannabinol and cannabidiol. GOV.UK, May 2025.
