HealthWise® L-Theanine is 100% pure pharmaceutical grade amino acid powder. and is generally regarded as a superior relaxant dur to its calmative properties. Unlike theanine sourced from green tea, HealthWise® L-Theanine is derived from corn and is not known to cause agitation. The true scientific name for L-Theanine is gamma-glutamylmethylamide, however it can also be known as N-methyl-L-glutamine or metheanine.