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.* 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 mitigating glutamate toxicity.* Jarrow Formulas® Theanine is made enzymatically from amino acids and is identical to the theanine found in green tea. Keep out of the reach of children.