L-Theanine is a highly bioavailable non-essential amide bioactive amino acids which can help maintain normal sleep, improve memory function and nullify effect of neurotoxins.

L-Theanine also known as L-γ-glutamylethylamide and N5-ethyl-L-glutamine, is an amino acid analogue of the proteinogenic amino acids L-glutamate and L-glutamine and is found primarily in particular plant and fungal species. L-Theanine increases serotonin, dopamine, GABA, and glycine levels in various areas of the brain, as well as BDNF and NGF levels in certain brain areas. It has also been found that injecting spontaneously hypertensive mice with L-Theanine significantly lowered levels of 5-hydroxyindoles in the brain. Researchers also speculate that it may inhibit glutamate excitotoxicity.