Every Day is D Day

“Millions of people are popping supplements in the belief that vitamin D can help turn back depression, fatigue, muscle weakness, even heart disease or cancer. In fact, there has never been widely accepted evidence that vitamin D is helpful in preventing or treating any of those conditions.” The NYT’s Gina Kolata wants to know why so many people are popping vitamin D. (And why we’re testing for its deficiency in the first place…)

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