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5-Hydroxytryptophan (5-HTP) is a naturally occurring essential amino acid and chemical precursor of the neurotransmitters serotonin and melatonin. Tryptophane is metabolized into 5-HTP, which is then converted into serotonin. 5-HTP supplements work by increasing the supply of the major building block material needed to create serotonin, which plays a central role in mood, hunger and sleep.

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