An influential panel of experts questioned two big reasons people take vitamin D supplements.
The U.S. Preventive Services Task Force concluded in draft recommendations released Tuesday that taking less than 400 international units of vitamin D and 1,000 milligrams of calcium every day doesn't reduce the risk for bone fractures among postmenopausal women. And so the task force recommended against doing that.
And the panel concluded that there was insufficient evidence that higher doses protect the bones of postmenopausal or premenopausal women, or reduce the risk for cancer.
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