Tetrahydrocannabinolic acid (THCA) is not your typical THC. It's the cannabinoid precursor to THC. When it is subjected to light or heat, it undergoes a process known as decarboxylation, which leads to it losing its carboxyl team and turning it into THC. With out THCA, there would not be THC. https://barryw345nlk5.frewwebs.com/profile