5-HTP is an amino acid needed to make serotonin. 5-HTP from Natural Factors uses timed-release caplets for a steady increase in serotonin levels that help promote healthy mood balance. 5-HTP is also used as a sleep aid. Additionally, it also helps relieve symptoms of fibromyalgia as well as reduces the severity and duration of migraine headaches when taken as a preventive treatment. Reg. price $40.98