Theanine 100 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. Theanine 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 antagonizing glutamate toxicity.* Jarrow FORMULAS?Theanine 100 is made enzymatically from amino acids and is identical to the theanine found in green tea.Other products from HerbsPro