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Vitamin D is an essential vitamin that helps your body absorb calcium and phosphorus. Not enough vitamin D -- a vitamin D deficiency -- can cause pain, hormone problems, muscle weakness, and more. Follow the links below to find WebMD's comprehensive coverage about how vitamin D helps your body, how much you need, how to get it, and much more.

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Thumbnail: The Truth About Vitamin D: Drug Interactions

Get answers to common questions on vitamin D.

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