Calcium is one of the most popular supplements. It is essential for building and sustaining bones and teeth. It also helps the heart and blood-clotting systems in the human body work properly. Many people also use calcium carbonate as an antacid. The recommended daily allowance of calcium for adults and children above the age of four is 1,000 milligrams. People suffering from tuberculosis or lung diseases can have too much calcium in their blood as a result of heightened levels of vitamin D. Medical conditions related to the thyroid can cause a calcium deficiency to occur. Calcium was first discovered and isolated in 1808.
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