NATURAL FACTORS - 5-HTP - 60 Time Release Caplet(s) - NPN: 80095775 -- 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 helps promote healthy mood balance. 5-HTP is also used as a sleep aid. Additionally, it helps relieve symptoms of fibromyalgia as well as reduces the severity and duration of migraine headaches when taken as a preventative treatment.