5-HTP is a precursor to serotonin.* Serotonin is a neurotransmitter involved in sending messages through the nervous system which contribute to a person's mood and well-being.* No artificial color, flavor or sweetener. No preservatives, sugar, starch, milk, lactose, soy, gluten, wheat, yeast, fish. Sodium free. *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.