Calcium carbonate is widely used medicinally as an inexpensive dietary calcium supplement for gastric anatacid. It may be used as a phosphate binder for the treatment of hyperphosphatemia. It is used in the pharmaceutical industry as an inert filler for tablets and other pharmaceuticals. Calcium carbonate is used in the production of calcium oxide as well as toothpaste and has seen a resurgence as a food preservative and color retainer.

Calcium carbonate is widely used medicinally as an inexpensive dietary calcium supplement for gastric anatacid. It may be used as a phosphate binder for the treatment of hyperphosphatemia. It is used in the pharmaceutical industry as an inert filler for tablets and other pharmaceuticals. Calcium carbonate is used in the production of calcium oxide as well as toothpaste and has seen a resurgence as a food preservative and color retainer.