Calcium carbonate

Calcium carbonate is an organic compound used as a source of the essential mineral calcium in dietary supplements. In a study of post-menopausal women, calcium carbonate was as bioavailable as calcium citrate 1. It is considered generally recognized as safe (GRAS) for use in foods by the U.S. Food and Drug Administration (FDA) 2.

This ingredient can be found in the following products in United States:


  1. Heaney, R.P., Dowell, S.D., Bierman, J., et al. Absorbability and cost effectiveness in calcium supplementation. J Am Coll Nutr 2001; 20(3): 239-46.
  2. Food and Drug Administration. EAFUS: A Food Additive Database. 10-17-2008. 12-4-2008.