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Cannabigerolic acid, the primary precursor cannabinoid from which most other cannabinoid acids are synthesized in the plant.
Cannabigerolic acid, or CBGA, is often called the mother of all cannabinoids because it is the primary chemical precursor from which all other cannabinoid acids are synthesized in the cannabis plant. Without CBGA, the plant would produce no THC, CBD, or any other cannabinoid.
CBGA is formed in cannabis trichomes through the combination of olivetolic acid and geranyl pyrophosphate. Once produced, enzymes within the plant convert CBGA into the three major cannabinoid acid branches: THCA (via THCA synthase), CBDA (via CBDA synthase), and CBCA (via CBCA synthase). Any CBGA that is not converted by these enzymes remains as CBGA, which decarboxylates into CBG when heated. This is why CBG levels are typically low in mature cannabis, as most CBGA has already been converted to other cannabinoids.
CBGA itself has attracted scientific attention for potential antibacterial, anti-inflammatory, and metabolic properties. A 2022 study published in the Journal of Natural Products found that CBGA (along with CBDA) could bind to the SARS-CoV-2 spike protein in laboratory settings, though this has not been tested in clinical trials. Breeders interested in CBG production harvest plants early in the flowering cycle before enzymes have converted most CBGA to other cannabinoids, or they develop cultivars with reduced synthase enzyme activity.