Hypoallergenic/Vegetarian/Kosher5-Hydroxytryptophan is a compound that is derived from the amino acid L-tryptophan. 5-HTP is a pre-cursor to neurotransmitters. The 5-Hydroxytryptophan used by Country Life is extracted from plant sources and is the purest form available. ! (5-Hydroxytryptophan)Other products from HerbsPro