L-theanine, also named N-ethyl-glutamine, with CAS number of 3081-61-6 and formula of C7H14N2O3, is a amide compound in white or off-white powder with melting point of 214-215, is easily dissolved in water, and has an incense of burned sugar and a taste of monosodium glutamate. Functions of L-theanine: (1) Absorption and metabolism (2) Adjusting changes of nerves conveying substances in the brain (3) Improvement on learning ability and memory (4) Sedation (5) Alleviating PMS Symptoms in Women (6) Protecting nerve cells (7) Lowering blood pressure (8) Enhancing the efficacy of anti-cancer drugs (9) Weight loss. 25kg/barrel.