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5-Hydroxytryptophan (5-HTP) is a naturally occurring amino acid and chemical precursor of the neurotransmitters serotonin and melatonin. Tryptophane is metabolized into 5-HTP by the body, and 5-HTP is in turn converted into the neurotransmitter serotonin. Serotonin is an important chemical in terms of mood, hunger and sleep. 5-HTP supplements work by increasing the supply of the building block material needed to make serotonin.

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