* 5-Hydroxytryptophan * Supports Serotonin Synthesis * Gluten Free * Dietary Supplement Jarrow Formulas 5-HTP (5-Hydroxytryptophan) is an extract of Griffonia simplicifolia seeds from coastal West Africa. Purity is assured by HPLC. 5-HTP is the direct metabolic precursor of serotonin and is important for the production of melatonin.