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An analysis finds that if you're deficient in vitamin D, taking a supplement might cut your risk of respiratory infections. But there's disagreement on what's considered deficient.
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The U.S. Preventive Services Task Force concluded in draft recommendations released Tuesday that taking vitamin D and 1,000 milligrams of calcium every day doesn't reduce the risk for bone fractures among postmenopausal women. So the group is taking steps to recommend that women refrain from taking the supplements for those purposes.