Ephedra: The deaths this year of football players who may have been taking nutritional supplements containing ephedra compounds has everyone from professional athletes to teenager dieters to weekend gym-rats wondering what they have been putting into their bodies and at what risk.

Phenyltropanolamine (PPA): An ingredient used in prescription and over-the-counter (OTC) drug products as a nasal decongestant to relieve stuffy nose or sinus congestion and in OTC weight control drug products to control appetite.

Rezulin: Use has been known to be the cause of jaundice, hepatitis, liver failure, liver transplants and the cause of at least 65 deaths since it was introduced.

Propulsid: Was prescribed for many adults suffering the symptoms of nighttime heartburn and for many infants suffering from collet. However, after the FDA linking the drug to dangerous side effects including at least 80 deaths, the manufacturer announced in March 2002 that Propulsid would no longer be marketed in the United States.