Tryptophan

**Definition:** 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.

**Tree numbers:** - D12.125.072.050.850 - D12.125.142.875

**Synonyms:** - Levotryptophan - L-Tryptophan