Calcium is a mineral that is an important component of diet and necessary for life. Approximately 98% of the body's calcium is stored in bones and teeth. Calcium is critical for building bones and teeth during childhood and for maintaining strong bones and teeth thereafter. In the rest of the body, calcium supports heart function, circulation, nerve function and muscle tone. Vitamin D increases the absorption of calcium, so it is important to make sure your diet contains enough of that nutrient. Kirkman's calcium capsules use Bisglycinate amino acid chelate, which has been demonstrated to have superior absorption qualities.