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, a hormone secreted by the pineal gland that aids biorhythm regulation.Ingredients5-HTP (S-Hydroxytryptophan) Other ingredients: Cellulose, magnesium stearaté (vegetable source) and silicon dioxide. Capsule consists of gelatin.  Directions For UseTake 1 capsule per day on an empty stomach or as directed by your qualified healthcare professional.  PrecautionsIf you have a medical condition, are pregnant, lactating, trying to conceive, under the age of 18, or taking medications (especially SSRls, MAOs, or sedatives) consult your healthcare professional before using this product. Keep out of the reach of children.