At the same time, Dr. Scott Gottlieb, the agency’s commissioner, suggested that Congress strengthen the F.D.A.’s authority over an estimated $40 billion industry, which sells as many as 80,000 kinds of powders and pills with little federal scrutiny

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— and put academic freedom on trial. When a Harvard researcher dared to point that out, in a scientific, peer-reviewed study and in media interviews, the supplement maker sued him for libel and slander.

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Every day in the United States, millions of expectant mothers take a prenatal vitamin on the advice of their doctor.

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Trying to gain an advantage over your opponent is as old as sport itself. But what’s considered fair and unfair is often up for debate

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The number of American adults who are using multiple medications and supplements is rising, with potentially dangerous side effects. Here’s how to cut back

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