Tens of millions of Americans take nutritional supplements. New studies allege some pills do not contain what is on the label. Other research indicates consumers may be ingesting too many vitamins. New concerns about dietary supplements.
"New York Times" science writer Gina Kolata presents her new book, which describes the fads, fictions, and genuine innovations that have defined the world of physical fitness.
- Gina Kolata author and "New York Times" science writer
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