Source Naturals, 5-HTP, 100 mg, 120 CapsulesDietary Supplement L 5 Hydroxytryptophan Supports Normal Sleep Cycles 5 HTP (L 5 Hydroxytryptophan) is an intermediate in the natural conversion of the essential amino acid, tryptophan, to serotonin. Clinical studies have shown that 5 HTP increases the amount and availability of serotonin produced by the body. Increased brain serotonin levels may produce positive effects on emotional well being, appetite regulation, melatonin production and