October 1998 Issue
5-HTP Impurity Same as in Tryptophan
It's déja vu "all over again." In September, researchers from the Mayo Clinic reported finding an impurity in 5-hydroxytryptophan, a popular supplement known as 5-HTP, marketed for relaxation and as a sleep aid. The researchers tested six brands of 5-HTP. All six contained an impurity called "peak X." The finding set off warning bells, because peak X is the same contaminant found in tryptophan supplements, which in 1991 were traced to nearly 1,500
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