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L-Tryptophan (Tryptophane), an essential amino acid, is necessary for normal growth in infants and for nitrogen balance in adults. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid) and of INDOLE ALKALOIDS in plants. It can be a precursor to NIACIN, although inefficiently in mammals.

L-Tryptophan (Standard) is a reference standard of L-tryptophan, suitable for quantitative analysis, quality control, and biochemical studies. L-Tryptophan is an essential amino acid that serves as a precursor for the biosynthesis of serotonin, melatonin, and vitamin B3, and plays important roles in neuroregulation and metabolism. In addition, L-tryptophan and its metabolic pathways can regulate the differentiation potential of bone marrow mesenchymal stem cells and may influence cell proliferation under specific conditions.