Calcium requires adequate vitamin D in order to be absorbed by the body. In the United States, many food sources of calcium such as milk are fortified with vitamin D. Update Date: 08/04/2008Elizabeth H. Holt, MD, PhD, Assistant Professor of Medicine, Section of Endocrinology and Metabolism, Yale University. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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