Vitamins and dietary supplements are a $37 billion business. Joshua Johnson takes them ... maybe you do, too. How do you know what's actually in that bottle? Does it even work? We hear from a skeptic, a lobbyist and a cancer researcher. | Want to support 1A? Subscribe to our podcast and give to your local public radio station at donate.npr.org/1A. Email the show at firstname.lastname@example.org.
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