Vitamin D For Dummies
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Vitamin D is essential for good health; however, it is a required nutrient only when you don't get enough ultraviolet B (UVB) rays from the sun. Unfortunately, many people can't get enough sun exposure and need to get vitamin D from their diet or from supplements. When you have enough vitamin D in your body, you can protect the health of your bones and prevent osteoporosis. New evidence suggests vitamin D may also help prevent many other diseases.

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Alan L. Rubin, MD has been a physician in private practice for more than 30 years. He is the author of several bestselling health titles, including Diabetes For Dummies, High Blood Pressure For Dummies, and Thyroid For Dummies.

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