CBG is the precursor to all other cannabinoids and is called the "mother of all cannabinoids." This article explains CBGA biosynthesis, its pharmacological profile, current research findings, and CBG-rich strains.
Cannabigerol (CBG) is often called the "mother of all cannabinoids" because it serves as the biosynthetic precursor from which all other cannabinoids in the cannabis plant are derived. Despite being discovered in 1964 alongside THC, CBG has received comparatively little attention until recently.
## The Biosynthesis
The cannabis plant synthesizes Cannabigerolic Acid (CBGA) from olivetolic acid and geranyl pyrophosphate. CBGA is the universal starting point from which: - THCA Synthase converts CBGA to THCA (THC precursor) - CBDA Synthase converts CBGA to CBDA (CBD precursor) - CBCA Synthase converts CBGA to CBCA (CBC precursor)
In THC- and CBD-rich strains, virtually all CBGA is consumed in these conversions. CBG-rich strains are bred with inactive synthase enzymes, allowing more CBGA to remain and decarboxylate to CBG.
## Pharmacological Profile
CBG is non-psychoactive. It acts as a partial agonist at CB1 and CB2 receptors, an agonist at alpha-2 adrenoreceptors (contributing to blood pressure lowering and muscle relaxation), a 5-HT1A antagonist (differentiating it from CBD which is an agonist), and inhibits GABA reuptake more strongly than THC or CBD.
## Key Differences from THC and CBD
Users often describe CBG as more energizing and focusing than CBD, with less sedation. The alpha-2 adrenoreceptor activity and GABA modulation may explain this profile.
## Current Research Highlights
**Inflammatory Bowel Disease:** A landmark 2013 study (Borrelli et al.) demonstrated that CBG significantly reduced disease severity in a mouse colitis model. A 2021 human survey study found that IBD patients using CBG-rich cannabis reported significant symptom improvement.
**Glaucoma:** CBG reduces intraocular pressure in preclinical studies without psychoactive effects, making it a potentially superior candidate to THC for glaucoma therapy.
**MRSA antibiotics:** A highly noted 2020 study (Farha et al., ACS Infectious Diseases) showed CBG was effective against methicillin-resistant Staphylococcus aureus, penetrating biofilms and showing activity against antibiotic-resistant strains.
**Neuroprotection:** CBG protects striatal neurons in Huntington's disease mouse models and improves motor deficits. Preliminary preclinical evidence exists for Parkinson's and ALS.
**Appetite stimulation:** A 2016 rat study showed CBG significantly increased appetite without psychoactive effects, relevant for patients with unwanted weight loss.
## CBG-Rich Strains
High CBG content requires either specially bred strains with inactive synthase enzymes (White CBG, Super Glue CBG) achieving 8–15% CBG, or harvesting plants very early (6–8 weeks into flowering) before CBGA conversion is complete.
## Safety
CBG is considered safe and well-tolerated with no psychoactive effects and no known addiction potential. Long-term human studies are still lacking.
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