HHCH
HHCH at a glance
Naturally occurring
Psychoactive
Cannabinoid type
Discovery year
Also known as
Molecular formula
C22H34O2
CB1 receptor interaction
CB2 receptor interaction
What is HHCH?
HHCH is an intoxicating semi-synthetic cannabinoid and the hydrogenated counterpart of THCH. It does not occur naturally in cannabis and is produced through chemical synthesis or conversion of cannabinoid precursors. HHCH is generally considered around 2 to 3× as psychoactively potent as Delta-9-THC, although its actual potency has not yet been reliably established in controlled human research.
HHCH has a six-carbon (hexyl) side chain, one carbon longer than the five-carbon (pentyl) side chain of HHC. It can also be considered the fully hydrogenated form of THCH, with the double bond in THCH’s central ring removed. HHCH exists as 9R and 9S epimers, which are formed during hydrogenation.
Commercial HHCH is generally produced semi-synthetically from cannabinoid precursors and supplied as a high-purity distillate with a viscous consistency. Its saturated structure makes HHCH more resistant to oxidation than THCH.
HHCH was first synthesised in 1942 during early research into THC homologues, but remained largely obscure for decades. It entered the commercial cannabinoid market in the early 2020s and was first formally identified on the European drug market in 2023. Modern research remains limited, particularly regarding its human effects, safety and pharmacokinetics.
How HHCH works in the human body
No dedicated receptor-binding or functional studies exist for HHCH specifically, so its activity is inferred from its close structural relationship to HHC and THCH, predicting CB1 and CB2 partial agonist behaviour with effects similar to Detla9-THC (potentially ~2-3x stronger depending on 9R/9S ratio). No confirmed data exist on its human metabolism or active metabolites.
CB1 receptor
The main cannabinoid receptor in the brain, responsible for THC’s intoxicating effects.
Direct 2026 research found that 9R-HHCH had an EC50 of ~4.1 nM and an Emax of ~33%, compared with ~0.5 nM and ~7.7% for Delta-9-THC. This means 9R-HHCH was only about 0.11x as potent by concentration, because more compound was needed to activate CB1, but once sufficiently activated it produced a 4.25x greater maximum CB1 response.
9S-HHCH showed the same general pattern. Its EC50 was ~69 nM, giving only about 0.007x the functional potency of Delta-9-THC, while its Emax reached 29.5%, approximately 3.79x THC’s maximum response.
HHCH may therefore require higher concentrations than Delta-9-THC to activate CB1, but can potentially produce a much stronger maximum receptor response once those concentrations are reached.
Historical animal research found HHCH to be approximately 1.86x as potent as Delta-9-THC, although the epimer ratio was unknown in this study.
Assuming a theoretical 70% 9R and 30% 9S mixture, the combined functional potency is approximately 0.08x Delta-9-THC, while the combined maximum CB1 response is approximately 4.1x. Averaging these with the historical 1.86x result gives (0.08 + 4.1 + 1.86) / 3 = 2.01x, supporting a theoretical psychoactive potency of approximately 2x Delta-9-THC. With a higher concentration, the maximum potency would likely be higher, up to 3-4x the maximum of Delta-9-THC.
CB2 receptor
The main cannabinoid receptor in the immune system, involved in regulating immune cell activity and inflammatory responses. As with CB1, there is no published binding or functional data for HHCH at CB2. By analogy with HHC, where the 9R epimer binds CB2 with high affinity (Ki approximately 13 nM, similar to THC) and the 9S epimer binds more weakly, a comparable CB2 interaction is plausible for HHCH, but this remains unverified and is based on extrapolation from related compounds.
Metabolism
Direct research using human liver cells shows that both 9R-HHCH and 9S-HHCH are extensively metabolised. Identified pathways include formation of hydroxylated, dihydroxylated, carboxylated and ketone-containing HHCH metabolites, sometimes involving several metabolic changes in the same molecule.
The two epimers show different patterns. 9S-HHCH is mainly converted into a hydroxylated metabolite, while 9R-HHCH produces a broader mixture including mono and dihydroxylated metabolites. The exact structures and pharmacological activity of these metabolites have not yet been established.
Human safety status
No human clinical trials, toxicology studies or receptor-binding research exist for HHCH itself. Its likely safety profile is inferred entirely from structurally related cannabinoids such as HHC and THCH, not from direct evidence, so a verified safety profile for HHCH cannot currently be established.
HHCH interactions with other compounds
Important disclaimer
This information is provided for educational and technical reference only. Interaction data can change as new research becomes available and may be incomplete or outdated. The real relevance of any interaction depends strongly on dose, route of administration, timing, formulation and individual metabolism. Readers should do their own research and consult a qualified healthcare professional before making decisions involving medicines, alcohol, nicotine, cannabinoids or other compounds. Elementra's products and information are intended for research, production and technical use only and are not intended for human consumption.
No Known Interactions Identified
Current Evidence
Limited Data
No sufficiently supported specific interactions between HHCH and other cannabinoids, common substances or medicines have currently been identified. HHCH-specific research has not yet shown that another compound meaningfully changes HHCH exposure or effects, or that HHCH meaningfully changes the exposure or effects of another compound. This should not be interpreted as HHCH having no interactions. Interactions may exist, but they have not yet been identified or characterized by research.
This content does not constitute advice
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