High Quality Content by WIKIPEDIA articles! 5-Hydroxytryptophan (5-HTP; Oxitriptan) is a naturally occurring amino acid, a precursor to the neurotransmitter serotonin and an intermediate in tryptophan metabolism. It is marketed in the United States and other countries as a dietary supplement for use as an antidepressant, appetite suppressant, and sleep aid. According to a 2001 meta-analysis, no sufficient high quality research had, at that point, been done to establish its effectiveness for treatment of clinical depression or dysthymia.

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