THCA is a cannabis compound with a laundry list of potential mental and physical health benefits. THCA is the non-psychoactive precursor to THC, the most famous cannabinoid of all. While THC is responsible for the psychoactive “high” that so many of us enjoy, THCA has shown great promise as an anti-inflammatory, neuroprotectant and anti-emetic for appetite loss and treatment of nausea. THCA is found in its highest levels in living or freshly harvested cannabis samples. For this reason some users choose to juice fresh cannabis leaves and flowers to get as much THCA as possible.