The FDA today warned consumers not to buy or use more than 25 products marketed for weight loss because they contain undeclared, active pharmaceutical ingredients that may be risky. Those products may be sold online or in stores as "dietary supplements."
But FDA tests found that the some of the products contained undeclared ingredients including sibutramine (a controlled substance), rimonabant (a drug not approved in the U.S), phenytoin (an antiseizure drug), and phenolphthalein (a solution used in chemical experiments and a suspected cancer-causing agent).