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.
Review Date:
8/4/2008
Reviewed By:
Elizabeth 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.