In 2005 there was a study reported in the British Medical Journal that didn't show any reduction in fracture risk for women who took 1,000 milligrams of calcium and 800 IUs of vitamin D a day.
Another study, The Women's Health Initiative, reported that calcium and vitamin D may lower risk of hip-fracture in women over 60. However, they also reported a 17% higher risk for kidney stones. It doesn't sound very promising when they quantify the risk for kidny stones but not for hip-fracture.
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