... quality of sleep, 4)diminish normal syptoms of PMS, L-theanine is clinically proven to reduce stress, improve the ... mental acuity and reduce negative side effects of caffeine. L-theanine is a non-protein amino acid mainly found ... known as gamma-ethylamino-L-glutamic acid, gamma-glutamylethylamide, r-glutamylethylamide, L-glutamic acid gamma-ethylamide and L-N-ethylglutamine.SPECIFICATION: Physical ...