Refinery29 -
17 Mar 2013 15:20

Deficient is not a word we like to hear used to describe us. Unfortunately, that’s what most of us are — in vitamin D, that is. It's estimated that three out of four Americans are D-deficient. Yet, how to get the needed vitamin — and exactly how much of it — is up for debate. That's why we scoped out the true lowdown on D. “Although our body doesn’t make vitamin D on its own, it does create the precursor to it, referred to as vitamin D2," says Jeffrey Mor...
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