Calcium supplements are usually used to prevent or treat low blood calcium levels in people who do not get enough calcium from their food. The amount of calcium required everyday varies with age and gender. The demand is generally higher during childhood, pregnancy, lactation and postmenopausal phase. Calcium supplements are used to treat patients with calcium deficiency, brittle bones, reduced absorption of nutrients after surgery performedto remove all or part of the stomach, bone softening and bone disease due to vitamin D deficiency.