Calcium is a mineral that is found naturally in foods.Calcium is necessary for many normal functions of the body, especially bone formation and maintenance.
Calcium citrate is used to prevent and to treat calcium deficiencies.
Calcium citrate is the calcium salt of citric acid. It is commonly used as a food additive (E333), usually as a preservative, but sometimes for flavor
Calcium citrate is sparingly soluble in water. The citrate in calcium citrate supplements actually works toward inhibiting stone formation. They act as a protective barrier between oxalate and calcium and prevent their bonding to form calculus. Thus increasing citrate levels would be an ideal way to eliminate calcium stones in the kidney.