For most people, the evidence doesn’t support any bone benefit of the popular supplements. The U.S. Preventive Services Task Force (USPSTF), an independent group of health experts, reviewed research on the role of vitamin D and calcium supplements in preventing fractures, and found that adding 400 IU of vitamin D and 1000 mg of calcium to a healthy diet does not lower risk of fractures in post-menopausal women, and that for younger women and for men, the studies are too inconclusive to support regular use of the supplements.
