Protocol for Life Balance, 5-HTP, 100 mg, 90 Veg Capsules(5 Hydroxytryptophan) Natural Source Supports Positive Mood Non GMO A Dietary Supplement Vegetarian Vegan How It Works: 5 HTP is the intermediate precursor in the natural synthesis of serotonin, a neurotransmitter that helps to regulate mood, appetite, and sleep wake cycles. 5 HTP readily crosses the blood brain barrier and clinical studies suggest that 5 HTP can support health serotonin levels. Serotonin is associated with positive mood and provides