Promotes healthy and restful sleepVitamin B6 helps convert tryptophan into serotonin500 mg of l-tryptophan per tabletSource Naturals L-Tryptophan with Coenzyme B-6 supports relaxation, restful sleep and positive mood. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response and sleep/wake cycles. L-Tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, it also converts to niacin in the body, which supports circulation, a healthy nervous system, the metabolism of food, and the production of hydrochloric acid for the digestive system. Coenzyme B-6 is required to convert tryptophan to serotonin.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.