Natural amino acid supplement containing 5-hydroxytryptophan. What is 5-HTP? . 5-Hydroxytryptophan or 5-HTP is an amino acid that converts to serotonin in the body. Serotonin is a substance that acts as a neurotransmitter or chemical that helps relay signals from one area of the brain to another. . How does 5-HTP support health? 5-HTP can elevate levels of serotonin which is associated with good mood in humans.*. 5-HTP can increase a sense of well-being.*. Why choose Vitacost 5-HTP? Free of the compound “peak X” for health safety reasons.*. Great quality great value. About Vitacost. Vitacost nutritional products are manufactured to high standards of quality efficacy and safety. Each Vitacost product meets or exceeds the standards and requirements set forth in the FDA’s Code of Federal Regulation (21 CFR 111) Current Good Manufacturing Practices (CGMP). . . *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose treat cure or prevent any disease.