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Supports relaxation Supports positive mood Supports restful sleep. L-Tryptophan is an essential amino acid; which means that 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 support positive mood, healthy sleep and proper immune system function. Each batch of NOW® L-Tryptophan is tested for the presence of Peak E and microbial contamination.
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