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What is HHC? Hexahydrocannabinol (HHC) is a semi-synthetic cannabinoid made in a lab, usually by converting hemp-derived CBD into THC and then adding hydrogen atoms to it. The result is a THC-like compound that produces a high. HHC appeared on the market in 2021 and was sold as a supposedly legal alternative to THC, but human research on it is very limited, poison centers in Europe have reported serious reactions, the UN placed it under international control in 2025, and the US Drug Enforcement Administration (DEA) states that HHC is a Schedule I controlled substance.
Peptide Labs sells hemp-derived CBD products. It does not sell HHC or any other semi-synthetic cannabinoid. This guide is general information as of October 1, 2026, not medical advice or legal advice.
Key Takeaways
- HHC is made by converting CBD into THC and then hydrogenating it, which yields two forms, 9R-HHC and 9S-HHC.
- Lab and early human data suggest HHC acts much like THC, and the 9R form is the more active one.
- Human research is a handful of tiny studies, case reports and poison center data.
- DEA says HHC is synthetic and already Schedule I; it gave HHC its own listing in May 2026.
- HHC metabolites can trigger a positive result on THC urine screens.
What is HHC and how is it made?
HHC is not new to chemistry. A 2023 review in Drug Testing and Analysis notes that its synthesis and THC-like activity were first reported about eight decades ago, during early research into the active compounds of marijuana and hashish. What is new is the mass market. According to the same review, commercial HHC is made from hemp CBD extract in two steps: CBD is cyclized into a mix of delta-8 and delta-9 THC, and that mix is then hydrogenated with the help of a catalyst.
Hydrogenation adds two hydrogen atoms and removes the double bond in THC’s ring. PubChem lists HHC as C21H32O2, compared with C21H30O2 for THC. The process produces two mirror-like forms, called epimers: 9R-HHC and 9S-HHC. Preclinical studies indicate that 9R-HHC has THC-like effects, and case reports describe it as the main psychoactive form, so the ratio between the two, which varies by batch, can change how strong a product is.
HHC vs THC
| HHC | Delta-9 THC | |
|---|---|---|
| Source | Semi-synthetic, made from CBD in a lab | Made by the plant (from THCA) |
| Formula | C21H32O2 | C21H30O2 |
| Forms | Mix of 9R and 9S epimers | One main form |
| Human research | A few tiny studies and case reports | Decades of research |
| Drug test | Metabolites can cross-react with THC screens | Detected as THC-COOH |
| US federal status | Schedule I (DEA) | Controlled as marijuana outside hemp limits |
In the comparison of HHC vs THC, the most useful fact is that they behave similarly but are not studied similarly. THC has a long research record and FDA-approved synthetic versions exist as prescription drugs. HHC has no approved medical use, no established safety profile and no quality standards. For how THC compares with CBD, see CBD vs THC.
HHC effects: what the research shows
The first controlled human data are very small. In a 2025 study from the University of Leipzig, published in Scientific Reports, six volunteers used HHC either as a gummy or from a vape, three per group. The researchers measured blood, urine and saliva levels and ran sobriety-style balance tests. They concluded that HHC’s pharmacokinetics and effects were comparable to THC, and that the route of use and individual differences strongly affected blood levels and how high people felt. Six people cannot establish safety or typical effects.
Reported HHC effects mostly come from case reports and poison centers, which collect problems rather than typical experiences:
- France (2022 to 2023). French poison centers logged 37 cases of self-reported HHC use. Symptoms were neurological in 85%, cardiovascular in 61%, gastrointestinal in 33% and psychiatric in 27%. Fifty-nine percent were hospitalized, two cases were severe, and every patient with a known outcome recovered. Only six had lab testing, and the authors thought THC also contributed in many cases.
- Czech Republic (2022 to 2024). The national toxicology center reviewed 236 reports involving HHC or the related compound HHCP. Children under 15 made up 19% of cases, 6.1% were severe, 98% recovered and no deaths were reported.
- Australia (2025 case report). A man who ate one gummy sold as a THC product developed vomiting, slurred speech, a fast heart rate and a dissociative-like state. Blood tests found only HHC. Symptoms resolved within eight hours.
Across these reports, the effects described include anxiety, nausea and vomiting, palpitations, chest tightness, confusion, hallucinations and, rarely, seizures or psychosis. Researchers at the EU Drugs Agency (EUDA) wrote in 2026 that little is known about the pharmacology, toxicology or long-term effects of semi-synthetic cannabinoids, and that products are frequently mislabeled or contain undeclared substances. If someone has chest pain, a seizure, trouble breathing or severe confusion after using any cannabis product, call 911. For other concerns, US poison centers can be reached at 1-800-222-1222.
Is HHC legal?
Is HHC legal? In the United States, DEA’s answer is no. In a final rule published in the Federal Register on May 4, 2026, DEA described HHC as a synthetic substance structurally related to tetrahydrocannabinols and said it was already controlled in Schedule I as a tetrahydrocannabinol. The rule gave HHC its own entry and drug code. DEA’s reasoning is that the 2018 farm bill removed only tetrahydrocannabinols in hemp from control, and that compounds produced through chemical conversion, even from hemp, are considered synthetic. DEA took the same position on synthetically derived tetrahydrocannabinols in a 2020 rule.
The new federal hemp definition points the same way. Signed November 12, 2025, it excludes cannabinoids that the plant cannot naturally produce, and natural cannabinoids synthesized or manufactured outside the plant. HHC made by hydrogenating converted CBD is manufactured outside the plant. Cannabinoids the plant cannot naturally produce lose hemp status on November 12, 2026, while the rest of the definition takes effect December 11, 2026. Which group a given compound falls into depends partly on lists FDA was directed to publish, and those lists had not appeared as of early September 2026. Our 2026 hemp rules guide has the full timeline. State laws also apply and vary. This is general information, not legal advice.
HHC outside the United States
HHC was first detected in Europe in 2022, and a wave of related semi-synthetic cannabinoids followed. In March 2025, the UN Commission on Narcotic Drugs added HHC to Schedule II of the 1971 Convention on Psychotropic Substances, the first semi-synthetic cannabinoid placed under international control. The decision took effect on December 6, 2025. UNODC says HHC had been reported in 56 countries and territories. The EUDA now monitors more than 30 semi-synthetic cannabinoids, many of them newer relatives of HHC.
Does HHC show up on a drug test?
It can. A 2025 Japanese study found that HHC’s main urinary metabolites, the HHC-COOH epimers, cross-reacted with three commercial urine panel tests designed to detect THC metabolites, and urine from a suspected HHC user tested positive on all three. A German forensic study also identified HHC-COOH as a metabolite of delta-9 THC itself. In other words, HHC is not a way to avoid a positive cannabis screen.
HHC, CBD and other cannabinoids
HHC is often shelved next to CBD and minor cannabinoids, but it belongs in a different category. CBG, CBN and CBC are compounds the plant can produce, even when some commercial versions are converted; our guide to CBG, CBN and CBC explains how they form and what research exists. HHC is made by chemically changing THC. If you use hemp products, a certificate of analysis is the only way to see what a batch actually contains; our guide on how to read a CBD certificate of analysis shows how to check the cannabinoid panel and the THC lines.
Peptide Labs carries CBD from naturally extracted hemp, such as Medterra Enhanced Relief Broad Spectrum CBD Oil, which lists CBD, CBG, CBN and CBDV and is described by Medterra as THC-free, with certificates of analysis on the brand’s website. Browse our CBD category to compare spectrum and lab reports.
Frequently Asked Questions
What is HHC?
HHC, or hexahydrocannabinol, is a semi-synthetic cannabinoid made by converting CBD into THC and then hydrogenating it. It produces THC-like effects.
Is HHC natural?
Commercial HHC is made in a lab. DEA describes it as a synthetic substance, even when the starting material is hemp CBD.
Is HHC stronger than THC?
There is not enough human research to say. Strength depends partly on the ratio of 9R-HHC, the more active form, to 9S-HHC, which varies by product.
Is HHC legal in the US?
DEA states that HHC is a Schedule I controlled substance and gave it a specific listing in May 2026. The new federal hemp definition also excludes cannabinoids manufactured outside the plant.
Will HHC make me fail a drug test?
It can. HHC metabolites cross-reacted with several THC urine screening tests in a 2025 study.
Does Peptide Labs sell HHC?
No. Peptide Labs sells hemp-derived CBD products and does not sell HHC or other semi-synthetic cannabinoids.
This article is general information as of October 1, 2026, not legal advice. Questions? Contact us. CBD products sold at Peptide Labs are hemp-derived and are not FDA-approved drugs. The FDA has not approved CBD as a dietary supplement or food ingredient, and hemp product rules vary by state. Check your state’s rules, follow each product label and talk to a healthcare provider before using CBD if you take medicines, are pregnant or nursing, or have a medical condition.
Last reviewed October 2026.
Related guides: Hemp Ban 2026: What the New Federal Hemp Definition Means for CBD, THCA and Delta-8, CBD vs THC: Chemistry, the High, Legal Status, Drug Tests and Safety, What Is CBG? CBG, CBN and CBC Explained: Origins, Research and Labels.