INS No. 170(i)
CAS No. 471-34-1
CI Pigment White 18
CI No. 77220
Calcium carbonate is a fine, white powder consisting essentially of precipitated calcium carbonate (CaCO3) prepared either by grinding naturally occurring limestone or synthetically, by precipitation.
Calcium carbonate can be used to color drugs, and food such as confectionery products.
Calcium carbonate is a food additive that is included in Table 3 of the General Standard of Food Additives (GSFA), and as such may be used in specified foods under the conditions of good manufacturing practices (GMP) as outlined in the Preamble of the Codex GSFA.
Joint FAO/WHO Expert Committee on Food Additives; Specifications for the Identity and Purity of Food Additives and their Toxicological Evaluation: Some Antimicrobials, Antioxidants, Emulsifiers, Stabilizers, Flour-treatment agents, acids, and bases. WHO Technical Report Series No. 339; FAO Nutrition Meetings Report Series No. 40 1965. Available online
Listing of Color Additives Exempt from Certification; Calcium Carbonate, 82 FR 51554 (Nov 7, 2017). Available online
Listing of Color Additives Exempt from Certification; Calcium Carbonate, 87 FR 58445 (Sept 27, 2022). Available online
EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS); Scientific Opinion on re-evaluation of calcium carbonate (E 170) as a food additive. EFSA Journal 2011;9(7):2318 [73 pp.]. Available online