Calcium is essential for bone development and maintenance, and plays important roles in much of the body's enzyme activity. It is required for muscle contraction, blood clotting, transmission of nerve signals, and regulation of heartbeat.

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Learn more about Calcium from our online encyclopedia.

Did You Know?

Calcium, folic acid could save health care costs

A study released at a House subcommittee hearing on the cost savings and health benefits of selected dietary supplements projected a $15 billion reduction in health care costs over a five-year period from the use of calcium and folic acid. The study found that five selected supplements—omega-3 fatty acids, glucosamine and saw palmetto along with calcium and folic acid—could make a significant impact on health care costs while positively affecting consumers’ health status. The $15 billion figure only pertains to calcium and folic acid usage. More savings would logically arise from the use of the other three supplements.