CBG: formats, dosage and precautions in France

CBG comes in several forms. Full-spectrum oils contain a minor fraction of it, alongside CBD and other secondary cannabinoids. CBG-enriched oils offer a specific CBD/CBG ratio, sometimes with CBG dominant. Flowers from CBG-dominant varieties are on the rise, selected for their particular profile - we set out their biosynthesis in our article on the mother molecule. Topical cosmetics (balms, creams) stay outside the scope of Novel Food, unlike ingested gummies and capsules.

The certificate of analysis (CoA), issued by an independent laboratory, should accompany any serious product. It states the real CBG content, the THC level (which must stay ≤ 0.30 % in the finished product) and the absence of prohibited cannabinoids such as HHC, H4CBD or THCP, classified as narcotics by the ANSM orders of 2023 and 2024. A seller who cannot provide that document at the time of purchase should give you pause.

No French authority recommends an official dosage for CBG. The practices seen in shops range from 5 to 25 mg per serving. The cautious method is the one used for CBD: start with the smallest amount stated on the label, keep the same dose for several days, then adjust gradually while noting how you feel. A useful benchmark for calibrating cautious use of cannabinoids generally: EFSA has published for CBD a provisional safe daily dose of around 2 mg per day for a 70 kg adult. For the detailed method, see our article on gradual CBD dosing.

Several brands position CBG as the cannabinoid of "concentration" or "focus". No controlled clinical study demonstrates any effect of CBG on attention or cognitive performance, and EFSA has approved no health claim to that effect under regulation EC No 1924/2006. Communication asserting that CBG "boosts concentration" falls outside the legal framework for permitted claims in France.

Toxicological data specific to CBG in humans remain insufficient. By analogy with CBD - for which ANSES proposed a reprotoxic 1B classification to the European agency ECHA in 2025 - CBG is not recommended for pregnant or breastfeeding women, women of childbearing age, minors, or people on medical treatment, because of possible interactions via the liver enzymes CYP3A4 and CYP2C9.

Where can you legally buy CBG in France?

From specialist shops and online retailers that provide a certificate of analysis per batch. Check that the product respects the 0.30 % THC threshold and contains no prohibited cannabinoid.

Can CBD and CBG be combined in the same product?

Yes, many oils bring the two cannabinoids together in varying ratios. No clinical study establishes an optimal ratio; the choice remains a matter of personal preference.

Does CBG make a saliva test positive?

CBG itself is not looked for by roadside drug tests. A full-spectrum product containing CBG may nonetheless contain traces of THC capable of triggering a positive test: choose a certified THC-free isolate if you drive.

Why have CBG gummies disappeared from some websites?

Since 15 May 2026, ingested products containing cannabinoids not authorised under the Novel Food regulation have been withdrawn from the French market, which affects some CBD/CBG gummies and capsules.