Prohibited, unlisted, even dangerous ingredients turn up in dietary supplements

When buying a dietary supplement, you probably assume that what’s on the label is what’s in the pill. But this assumption doesn’t always hold up, says Pieter Cohen, a physician at Cambridge Health Alliance. In March, Cohen published his 14th paper concerning dietary supplements that contained either prohibited or unlisted ingredients. This time, he and his colleagues analyzed 17 brands of sports and weight-loss supplements sold in the United States, and they detected nine prohibited stimulants...