L Tryptophan

Tryptophan is an essential amino acid that must be obtained from foods, such as milk. It is a precursor of the neurotransmitter serotonin. Tryptophan has been long used as a sleep aid and may have an effect on mood disorders, such as seasonal affective disorder and PMS.
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Doctor's Best, Best L-Tryptophan, Tryptopure, Powder, 50 g

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