Jarrow Formulas Theanine 100mg promotes relaxation and learning ability. Theanine is a unique amino acid found almost exclusively in green tea that exerts beneficial effects on brain metabolism. Theanine induces relaxation without causing drowsiness, as measured by increased generation of alpha-waves. It also may improve learning ability and sensations of pleasure by affecting dopamine and serotonin neurotransmitters in the brain. Also, theanine exerts protective effects on the brain by mitigating glutamate toxicity. Theanine is made enzymatically from amino acids and is identical to the theanine found in green tea. Recommended Use: Take 1 capsule per day with water or juice on an empty stomach or as directed by a healthcare professional. Jarrow Formulas Theanine 100mg Facts: 2 capsules contain: L-Theanine 200 mg Other Ingredients: Capsule (hydroxypropylmethylcellulose, water), microcrystalline cellulose magnesium (vegetable source) and silicon dioxide. Microcrystalline cellulose, capsule (hydroxypropylmethylcellulose, water), magnesium stearate (vegetable source) and silicon dioxide.