CBG is often referred to as the ‘parent cannabinoid’. All phytocannabinoids start out as CBG in their developmental processes.
All cannabinoids start as CBG. It is a non-intoxicating compound, and of medical interest for pain management and anxiety relief.
Summary from Wikipedia:
Cannabigerol (CBG) is one of more than 120 identified cannabinoid compounds found in the plant genus Cannabis. Cannabigerol is the non-acidic form of cannabigerolic acid, the parent molecule from which other cannabinoids are synthesized. Cannabigerol is a minor constituent of cannabis. During growth, most of the cannabigerol is converted into other cannabinoids, primarily tetrahydrocannabinol (THC) or cannabidiol (CBD), leaving about 1% cannabigerol in the plant.Read more