What Is HHC?
HHC is hexahydrocannabinol. It is a cannabinoid made by adding hydrogen to THC. The reaction saturates one double bond in the THC molecule. The finished compound binds the same CB1 and CB2 receptors as THC.
HHC occurs in cannabis plants at trace levels. Almost all HHC sold in US shops comes from a lab reaction, not a plant.
How HHC Is Made
Chemists start with THC or CBD. They add hydrogen gas and a metal catalyst such as palladium or nickel. The step is called hydrogenation. THC has the formula C21H30O2. HHC has the formula C21H32O2. The gap is two hydrogen atoms.
Roger Adams first reported HHC in 1944. His lab hydrogenated THC to test how the double bond changed the effect.
The reaction yields two forms: 9R-HHC and 9S-HHC. The 9R form binds receptors with more strength. Most product labels do not state the ratio of the two.
HHC vs. THC and CBD
- THC: psychoactive. Schedule I under federal law.
- HHC: also psychoactive in user reports, with lower strength than THC in most accounts.
- CBD: not psychoactive at common doses. HHC is not CBD. The two have different formulas and different receptor activity.
- HHC products carry no FDA approval.
Effects and Potency
Human data on HHC is thin. Receptor assays and animal studies make up most of the published record. Users report effects that resemble THC: relaxation, altered perception, dry mouth, and a faster heart rate. Strength reports vary. Some users place HHC at 50 to 80 percent of THC strength. No controlled human trial confirms that range.
Legal Status in the US
The 2018 Farm Bill covers hemp and hemp derivatives. It does not name HHC. DEA rulemaking states that tetrahydrocannabinols made by chemical conversion remain Schedule I. Several states ban HHC by name. The list changes each legislative session. Check your state statute before you buy or sell.
Lab Testing and Safety
Hydrogenation can leave residual solvents, unreacted THC, and metal catalyst residue in the final oil. A certificate of analysis from an ISO 17025 lab should list cannabinoid potency, residual solvents, heavy metals, pesticides, and microbials. Match the batch number on the COA to the batch number on the package. If the numbers differ, the test does not apply to that product.
FDA has not approved HHC as a drug or as a food additive.
Drug Tests
Unknown. HHC metabolites differ from THC-COOH, the target of common urine immunoassays. Anecdotal reports conflict. No peer-reviewed study confirms that HHC use escapes detection on a standard drug screen.