Calcium citrate is the calcium salt of citric acid used as a source of the essential mineral calcium in dietary supplements. Calcium citrate is approved for use as a food additive by the U.S. Food and Drug Administration (FDA) 1.
Food and Drug Administration. EAFUS: A Food Additive Database. http://www.foodsafety.gov/~dms/eafus.html. 10-17-2008. 12-4-2008.