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5-HTP

5-HTP or 5-Hydroxytryptophan cannot be sourced from the diet and is made by the body from tryptophan. 5-Hydroxytryptophan (5-HTP), also known as oxitriptan, is a naturally occurring amino acid and chemical precursor as well as a metabolic intermediate in the biosynthesis of the neurotransmitter serotonin.  

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