5-Hydroxytryptophan is an intermediate metabolite in the pathway from tryptophan to serotonin. 5-hydroxytryptophan supplementation enhances serotonin levels. Serotonin is involved in the body's control of sleep, mood regulation, and appetite. Dosage:1 to 2 capsules tid Each Capsule Contains DV% Vitamin B6 (from 5 mg Pyridoxal 5'-Phosphate) 3.4 mg * 5-Hydroxytryptophan 50 mg * *Daily Value (DV) not established SA503/ 90 A woman who is pregnant, or who might become pregnant, should not use 5-hydroxytryptophan. 5-hydroxytryptophan is specifically contraindicated during pregnancy. SPECIAL NOTE: Should be used with caution with prescription anti-depressants.