Calcite
Calcium carbonate is GRAS as a direct food additive under 21 CFR 184.1191 and authorized in EU as E 170. Used safely as a calcium source and acidity regulator.
What it is
Crystalline form of calcium carbonate (CaCO3); the most stable polymorph of calcium carbonate.
Food: calcium fortification, anticaking agent, dough conditioner, antacid. Cosmetic: opacifier, abrasive.
Why it's flagged
- Excessive intake can cause hypercalcemia/constipation
What regulators actually say
"Calcium carbonate (CaCO3, CAS Reg. No. 471-34-1) is prepared by three common methods of manufacture... The ingredient is used as a nutrient supplement... GRAS as a direct human food ingredient at levels not to exceed current good manufacturing practice."
Regulatory status
United States — FDA
GRAS direct food additive (21 CFR 184.1191).
European Union — EFSA
Authorized food additive E 170 (calcium carbonates); ADI not specified.
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