Vitamin D Helps Bone Health Only With Calcium, Tufts Medical Center Study

A new analysis on the effects of vitamin D on bone health shows that it cuts fracture risk in older adults, but only when taken with calcium supplements. The review of nearly 50 studies on vitamin D -- present in a small number of foods and produced naturally in the skin with sun exposure -- by the U.S. Preventive Services Task Force (USPSTF) also indicates that it's too soon to tell if vitamin D supplements can help prevent cancer.