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CBC vs CBG: Two Minor Cannabinoids, One Trial Between Them

CBG is what remains of the plant’s parent precursor when the converting enzymes have not used it up. CBC is one of the three products those enzymes make. Neither is intoxicating. CBG has one small human trial; CBC has none, and the published literature cannot agree on whether CBC activates CB1.

About this page. This is editorial science writing, not product information. It describes what published research has reported and what European regulation says. Under Regulation (EC) No 1924/2006 no health claim for any cannabinoid is authorised in the EU, so nothing here states or implies that any product will produce a health effect for you. Descriptions of trial results are reports of what researchers measured in their study populations, at the doses they used. Where a compound is discussed alongside an Endoca product, see the applicable product page for the information EU law permits us to give.

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At a glance

Property
CBC
CBG
Position in pathway
A branch product, via CBCA synthase
The unconverted parent
CB1 receptor
Disputed. No activation in one study, Ki 11 nM in another
Weak, Ki around 1.3 μM
CB2 receptor
CB2-preferring agonist, Ki 27 nM
Weak partial agonist, Ki 490 nM
Most potent measured target
TRPA1, EC50 approximately 0.09 μM, among the strongest tested
Alpha-2 adrenoceptor, EC50 0.2 nM
Anandamide uptake
Inhibits, more strongly than CBD
Inhibits
Intoxicating
No
No
Human trials
None
One, 34 participants, 20 mg
Human pharmacokinetics
None
None
EU food status
Unauthorised novel food
Unauthorised novel food

How each one arises

Cannabis builds CBGA, then three enzymes compete for it. THCA synthase makes THCA, CBDA synthase makes CBDA, and CBCA synthase makes CBCA, which decarboxylates to CBC.

CBG is what is left over. In a typical high-CBD cultivar, almost none is, which is why CBG products cost more.

CBC is a genuine third branch, parallel to THC and CBD rather than downstream of them. It is present at low levels in most extracts.

Mechanism, with the disagreement stated

Inner - CBC vs CBG

CBG’s most striking measurement is alpha-2 adrenoceptor agonism at an EC50 of 0.2 nanomolar, from a 2010 study in mouse brain membranes. The same study found the effect substantially weaker in isolated tissue, leaving its physiological relevance open. CBG is also a 5-HT1A antagonist at a KB of 51.9 nanomolar. At cannabinoid receptors it is weak and, at higher concentrations, antagonistic.

CBC’s literature is contradictory in a way worth being open about. A 2019 paper in the British Journal of Pharmacology found CBC does not activate CB1 at all and is a selective CB2 agonist with higher efficacy there than THC. A 2020 paper reported a CB1 binding affinity of 11 nanomolar along with functional activity. Both cannot be right. The reasonable summary is that CBC is a CB2-preferring agonist whose CB1 activity is disputed.

Where CBC is clearly potent is TRPA1, at an EC50 of 0.09 micromolar, among the strongest of the phytocannabinoids tested in that study. Notably, CBC’s anti-inflammatory and gut motility effects in mouse models operated through TRPA1 rather than through cannabinoid receptors.

A further complication for CBC: a 2025 study showed its two mirror-image forms behave differently at CB2, and commercial CBC is not necessarily one form.

The evidence

CBG
CBG has one placebo-controlled human trial: 34 healthy adults, 20 mg, published 2024, reporting reduced anxiety and stress scores and improved verbal memory.
Small, healthy volunteers, remote administration.
CBC
CBC has zero controlled human trials.
Everything published is cell culture or rodent work.

Neither has published human pharmacokinetics. Every dosing figure on a CBC or CBG label is an estimate rather than a measurement.

What people get wrong

01 CBC is a potent anti-inflammatory.
In mice, through TRPA1. Untested in people.
02 CBG is proven for gut health, glaucoma or antibacterial use.
Rodent and in vitro only. The one human trial examined anxiety, stress and memory.
03 Combining minor cannabinoids produces an entourage effect.
The experiments designed to test that hypothesis found cannabis terpenes do not bind or modulate cannabinoid receptors, and a 2024 scoping review found limited evidence for it as a stable phenomenon.

How Endoca tests for this

CBC and CBG both appear on our batch certificates alongside CBD, CBDA, CBN, THC and THCA. For minor cannabinoids especially, a laboratory number tied to a batch code is the only meaningful statement about content, because at these levels “contains CBC” can mean almost anything.

Frequently asked questions

Neither has enough human evidence to answer that.

No.

Low natural abundance and the isolation work required.

Usually both, at low levels. Check the certificate of analysis.

References

01

Cascio MG et al. Br J Pharmacol 2010;159:129-141.

02

Udoh M et al. Br J Pharmacol 2019;176:4537-4547.

03

Zagzoog A et al. Sci Rep 2020;10:20405.

04

De Petrocellis L et al. Br J Pharmacol 2011;163:1479-1494.

05

Cuttler C et al. Sci Rep 2024;14:16163.

06

Simei JLQ et al. Cannabis Cannabinoid Res 2024;9:1202-1216.

Last reviewed 1 September 2026.

Educational information about published research and European regulation. Not a health claim.