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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: Are You Getting Enough Vitamin D and Calcium?

    Vitamin D and calcium are essential for bone health. How to know if you're getting enough.

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