of Zen contains a combination of L-theanine and GABA. L-theanine is found in green tea (Camellia sinensis). Serving Size: 1Vegetable Capsule Servings Per Container: 60 Amount Per Serving: GABA (Gamma-Aminobutyric Acid) 550 mgL-Theanine Other Ingredients: Hydroxypropyl methylcellulose, microcrystalline cellulose, rice hull concentrate, gum arabic, sunflower oil As a dietary supplement, 1 or 2 capsules daily between meals, or as directed by a healthcare practitioner.If taking antidepressants or other psychotropic medications, use only under the supervision of a qualified healthcare practitioner. Although we are not aware of any interactions, because these also affect brain function there is theoretical potential for negative or positive interactions, either of which would need to be monitored. Keep in a cool, dry place, tightly capped.