An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals.

Synonyms: L-Tryptophan-ratiopharm, ratio Tryptophan, Levotryptophan, Tryptophan, Ardeydorm, PMS-Tryptophan, 8DUH1N11BX, 0, Optimax, Trofan, Tryptophan Metabolism Alterations, L-Tryptophan, L Tryptophan, PMS Tryptophan, ratio-Tryptophan, L Tryptophan ratiopharm, Ardeytropin, Tryptacin, Tryptan, Naturruhe, Lyphan