Glossary
Cannabinol (CBN)
Updated:
Cannabinol, or CBN, is a mildly psychoactive cannabinoid that forms when THC oxidizes with age, heat and light. Fresh hemp contains almost none. Most commercial CBN is made by converting CBD in a lab, which matters under the federal rule for cannabinoids made outside the plant.
Cannabinol was the first cannabinoid ever isolated, decades before THC or CBD. It is not made directly by the plant. It is the oxidation product of THC, so cannabis that has been stored for a long time shows rising CBN as THC breaks down (Plants 2022).
Hemp starts with very little THC, so natural CBN yields from hemp are tiny. To make CBN at commercial scale, processors usually start with CBD and run it through chemical conversion steps. The finished molecule is identical, but the route is not natural.
That route now matters. The amended federal hemp definition excludes cannabinoids that are synthesized or manufactured outside the plant, with the exclusion for cannabinoids the plant cannot naturally produce effective November 12, 2026, and the rest effective December 11, 2026 (7 U.S.C. 1639o; P.L. 119-37 sec. 781). A certificate of analysis shows how much CBN is present, not how it was made, so a supplier process attestation is the only way to document origin.
CBN is considered weakly psychoactive, with a receptor profile that is still being characterized (Plants 2022).
Sources
- Cannabinol: History, Syntheses, and Biological Profile of the Greatest Minor Cannabinoid (Plants, 2022) PubMed (accessed 2026-10-13)
- 7 U.S.C. 1639o, Definitions (hemp) Cornell Legal Information Institute (accessed 2026-10-13)
- Public Law 119-37, section 781 (hemp definition amendments) GovInfo (accessed 2026-10-13)