Allergy Research Group 200mg of Zen offers a unique and natural path to calmness, day or night. This formula contains a combination of L-theanine and GABA. L-theanine is found in green tea (Camellia sinensis) and has been shown to support the production of alpha-wave activity in the brain. * These statements have not been evaluated by the U.S. Food and Drug Administration. This product is not intended to treat, mitigate, diagnose or cure any disease.