THCA gummies vs Delta-9 gummies may sound like a comparison between two nearly identical cannabis edibles. Chemically, however, there is an important difference. THCA (tetrahydrocannabinolic acid) is the acidic precursor to delta-9 THC. Delta-9 THC is the neutral cannabinoid strongly associated with the intoxicating effects of cannabis. THCA can convert into delta-9 THC through decarboxylation,