That can lead to osteoporosis. But a recent study published in the New England Journal of Medicine found that taking calcium with Vitamin D supplements can cut the risk of osteoporosis in half. Most people don't. So dietary supplements of calcium and vitamin D are important. Calcium is necessary for the strength of bone.
Vitamin D allows the body to absorb calcium through the intestines.
And it's good news, since dietary supplements are inexpensive and not dangerous.