Jarrow formulas 5-HTP (5-Hydroxytryptophan) isan extract of Griffonia simplicifolia seeds from coastalWest Africa and is verified to be free of the peak X contaminant. Purity is assured by HPLC. 5-HTP is the direct metabolic precursor of serotonin and is importantfor the production of melatonin.Other products from HerbsPro