Due to its high reactivity, calcium is rarely found in its elemental (or pure) state in nature. Similarly, you cannot buy pure calcium; it is always combined with another element to make it less reactive. During digestion, your body breaks the combination of calcium and other elements apart to make the calcium available for absorption.
What this means is that a 500 mg calcium supplement tablet may not be 500 mg of calcium, but a 500 mg mixture of calcium and other elements. The actual amount of usable calcium in a supplement is called elemental calcium.
Check out this hub: Do Calcium Supplements Cause Kidney Stones and Constipation for more information about Calcium
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