Hemp Therapies Wiki / Cannabinoids & Plant Chemistry

Cannabinoid Comparison: CBD, THC, CBG, and CBN

Hemp and cannabis plants produce a family of related compounds called cannabinoids. CBD, THC, CBG, and CBN are four of the most commonly discussed, and while they share a chemical origin, each is structurally and functionally distinct.

A Shared Origin

CBG (cannabigerol) is the active form of CBGA (cannabigerolic acid), the first of more than 113 cannabinoids the plant produces — which is why CBGA is often described as the “mother” cannabinoid the others are built from. As hemp plants mature, CBD content rises while CBG levels decline; by harvest, a crop typically contains ample CBD but only trace amounts of CBG, CBN, THC, and other minor cannabinoids. CBN is not produced directly by the plant in meaningful quantities — it forms as THC breaks down over time. CBD, by contrast, is not a byproduct of THC and does not cause intoxication.

How Each Interacts With the Body’s Receptors

CBG binds with the body’s endocannabinoid receptors, CB1 and CB2. CBD interacts with the same receptor system without binding to it in the same direct way, instead producing indirect effects through multiple pathways. CBN also binds the same receptors, though laboratory research describes its CB1 binding as roughly ten times weaker than THC’s. THC is the cannabinoid responsible for cannabis intoxication; hemp plants are required to contain only trace amounts of it — 0.3% by dry weight or less.

Why Products List More Than One Cannabinoid

Full- and broad-spectrum hemp extracts naturally contain a range of cannabinoids beyond CBD, including CBG and CBN, alongside terpenes and other plant compounds — which is why product labels increasingly list more than one cannabinoid. CBC (cannabichromene) is another distinct minor cannabinoid found in many hemp extract products, separate from CBD, THC, CBG, and CBN.

Summary

CBD, THC, CBG, and CBN all originate from the same plant chemistry but diverge in structure and in how they interact with the body’s receptors. CBG sits earliest in the plant’s cannabinoid-production chain, CBD and THC are the two most familiar and chemically distinct end products, and CBN forms afterward, through THC’s breakdown rather than direct production by the plant.