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Doctor's Best L-Tryptophan Featuring TryptoPure is an essential amino acid that promotes normal, restful sleep and healthy mood & behavior.*

Best L-Tryptophan contains L-tryptophan from TryptoPure, a highly purified, pharmaceutical-grade L-tryptophan. L-tryptophan is a biochemical precursor for serotonin, which is the main source of the body's melatonin.*


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