L-5-hydroxytryptophan (5-HTP) supplements

September 1998

The Mayo Clinic and the FDA are both finding potentially dangerous impurities in L-5-hydroxytryptophan (5-HTP) supplements.

There are a lot of OTC products with this ingredient: PhenCal, Thin-Thin, etc. They're widely promoted for weight loss...depression...insomnia, etc. L-5-hydroxytryptophan (5-HTP) is a metabolite of L-tryptophan.

These amino acids are used to increase serotonin production.

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