A healthy adult body holds over 2 pounds of calcium.
Most calcium is stored in the bones and teeth.
A smaller amount is in all of the body's cells, circulating in the bloodstream and in other body fluids. In nature, as in supplement tablets, calcium is combined with other compounds. For example, calcium gluconate, calcium lactate, and calcium carbonate are some of the formulations you may see. Look for the amount of elemental calcium in each tablet. 130 mg Calcium gluconate 100 mg calcium carbonate is 40 percent calcium and 60 percent carbonate.