Calcium Carbonate
Also known as: E170i, Chalk, E170
Calcium carbonate is FDA GRAS under 21 CFR 184.1191 and authorized in the EU as E170. EFSA's 2023 re-evaluation found no safety concerns at currently reported uses, including in foods for infants below 16 weeks.
What it is
Calcium carbonate (CaCO3), a naturally occurring mineral (limestone, chalk) used as a calcium source, anticaking agent, and pH regulator in food.
Calcium fortifier, anticaking agent, acidity regulator, color (white).
Why it's flagged
- Possible aluminum impurities (purity-spec issue)
- Excessive intake can cause hypercalcemia or kidney stones in susceptible individuals
What regulators actually say
"Calcium carbonate (CaCO3, CAS Reg. No. 471-34-1), also known as chalk, is prepared by three common methods of manufacture... is generally recognized as safe (GRAS) when used in food in accordance with good manufacturing practice."
"The Panel concluded that there is no need for a numerical ADI for calcium carbonate (E 170) and there are no safety concerns with respect to exposure to calcium carbonate per se at the currently reported uses and use levels."
Regulatory status
United States — FDA
GRAS under 21 CFR 184.1191
European Union — EFSA
Authorized as E170 under Regulation (EC) No 1333/2008
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