Purity and Potency 5-hydroxytryptophan is a compound produced in the body from the amino acid tryptophan. It is a precursor to the neurotransmitter serotonin and the hormone melatonin. Premium Supplement 5-HTP is the primary active ingredient derived from Griffonia simplicifolia seed, a type of plant found in western parts of Africa. Ultimate Daily Support At Piping Rock, our 200 mg 5-HTP is gluten-free and non-GMO providing powerful nutritional support from this ingredient. Piping Rock's Promise: Piping Rock proudly offers an ever-growing selection of products designed to help you achieve your unique wellness goals. We verify all products with third-party, FDA-registered agencies ensuring purity, potency, safety, and innovation in everything we do. We’re committed to supporting you in your journey to healthy living, and we thank you for choosing us!