Calcium Hydrogen Carbonate
Also known as: E170ii, Calcium bicarbonate, Calcium acid carbonate
Calcium carbonate (E170) is FDA GRAS at GMP levels and is widely used as a calcium source and acidity regulator. EFSA's 2011 reevaluation found no safety concerns at reported uses; intake should still be considered against the calcium Tolerable Upper Intake Level (2,500 mg/day for adults).
What it is
Calcium hydrogen carbonate (calcium bicarbonate), an unstable salt typically existing in solution; the food additive E170 covers calcium carbonates.
Acidity regulator, anticaking agent, calcium fortificant, raising agent.
Why it's flagged
- risk of exceeding calcium UL when combined with supplements
What regulators actually say
"Calcium carbonate ... is used in food with no limitation other than current good manufacturing practice."
Regulatory status
United States — FDA
GRAS — 21 CFR 184.1191
European Union — EFSA
Authorized as E170; reevaluation found no safety concern at reported uses
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