Calcium carbonate
Chalk — mineral white, also a calcium source.
- Vegan
- Yes
- Vegetarian
- Yes
What it is
Calcium carbonate is a common mineral salt used as a white food colorant, anti-caking agent, and calcium supplement.
How it is used in food
Acts as an effective white pigment, firming agent, and a dietary source of calcium.
Commonly found in- Fortified plant milks
- Baking powder
- Chewing gum
- White sweets
Health and safety
None at the levels used in food. Calcium carbonate is the same calcium your body needs, and it doubles as a calcium supplement. Very large supplement doses can cause constipation, but food use is far below that.
Permitted at quantum satis — no numerical limit, because no safety concern was identified at any realistic food use.
Regulatory status
| Region | Status | Notes |
|---|---|---|
| Australia & New Zealand FSANZ |
Permitted | Permitted under the FSANZ Food Standards Code. |
| European Union EFSA / European Commission |
Permitted | Authorised for food use under EU regulations (Annex II). |
| United States FDA (Food and Drug Administration) |
Permitted | Authorised for food use by the FDA (often GRAS for standard additives). |
How it is made
Mined from limestone or marble, or derived from crushed oyster shells.
- Mining and Purification — Mined from limestone deposits and then ground or chemically purified for food grade use.
Worth knowing
Chalk and limestone are naturally occurring forms of calcium carbonate.
Conclusion
There is no reason to avoid calcium carbonate in your food. Mined from limestone or derived from oyster shells, this mineral salt acts as a white pigment and calcium source in plant milks and baking powder. EFSA permits it with no numerical limit because it poses no safety concern at food levels.
References
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Open the appEntry last reviewed 2026-07-28.
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