


L-Tryptophan is an essential amino acid; therefore it is not synthesized by the body and must be obtained from the diet. L-Tryptophan is critical for the production of serotonin and melatonin which help to support a positive mood healthy sleep patterns and proper immune system function.* Every lot of NOW® L-Tryptophan is tested to be free of Peak E and microbial contamination.
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