l-theanine from green tea extract what is l-theanine? l-theanine is an amino acid found in green tea that produces tranquilizing effects in the brain. l-theanine is also a derivative of glutamic acid which is one of the neurotransmitters found in the brain. l-theanine may have the following application: 1) diminishing symptoms of pms, 2) improving learning performance, 3) heightening mental acuity - neurotransmitter, 4) promoting concentration, 5) acting antagonistically against the paralysis induced by caffeine, 6) supporting the immune system, 7) lowering blood pressure, 8) increasing formation of the inhibitory neurotransmitter gaba, and 9) increasing brain dopamine levels among other positive benefits with no known downside your early reply will be appreciated and wish you all of the best and regards ! sincerely yours, sales manager ms.mary liu organic herb inc. phone +86 731 4060868 mobile +86 135 0745 8583(24 hours working) fax +86 731 4023669 email: mary@organic-herb.com msn:liulingling20035@hotmail.com website: http://www.organic-herb.com add: no.1038.shanshuirenjia3rd.kaiyuanroad, xinsha, changsha, hunan, china 410100