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

To continue reading this entire article you must be a paid subscriber.

Subscribe to Environmental Nutrition

Get the next year of Environmental Nutrition for just $20. And access all of our online content - how to fight heart disease, cancer, stroke, diabetes, osteoporosis, Alzheimer's, and dozens of other diseases - free of charge.

Already subscribe but haven't registered for all the benefits of the website? Click here.

Subscriber Log In

Forgot your password? Click Here.