Dietary Supplement. Potent serotonin precursor. Reduce carbohydrate cravings; Enhance mood; Control appetite. 5-HTP (5-Hydroxytryptophan) is the immediate precursor to serotonin (5-HT, 5-hydroxytryptamine). Serotonin plays an important role in the regulation of mood, appetite, body temperature, and the secretion of various hormones. (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.)