NOW Supplements 5-HTP is a dietary supplement that supports a positive mood and relaxation. It is extracted from the seed of an African plant (Griffonia simplicifolia) and is the intermediate metabolite between the amino acid L-tryptophan and serotonin. 5-HTP supports the production of serotonin in the brain and central nervous system, which can impact sleep, mood, appetite, and body temperature. These vegan capsules are dairy-free, egg-free, kosher, made without gluten, non-GMO, nut-free, and soy-free. Natural color variation may occur in this product. GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation). Packaged in the USA by a family-owned and operated company since 1968.