SOURCES: Medline Plus: "Calcium Supplements (Systemic)" and "Calcium in Diet." National Digestive Diseases Information Clearinghouse: "Lactose Intolerance." NIH Office of Dietary Supplements "Dietary Supplement Fact Sheet: Vitamin D" and "Dietary Supplement Fact Sheet: Calcium." UC Berkeley Wellness Guide to Dietary Supplements. USDA: "Dietary Guidelines for Americans 2005." WebMD: "Is Calcium a Bust for Bones?"

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