Is Calcium Carbonate Vegetarian?
CautionSometimes. Calcium carbonate (e170 or chalk) usually comes from chalk, limestone, or marble, though it can come from egg shells or animal bone. If the label does not provide a source, we recommend calling the manufacturer.
Calcium Carbonate and the Vegetarian Diet
Calcium carbonate, identified by its additive code E170, is a naturally occurring compound found in rocks such as chalk, limestone, and marble. It serves multiple purposes, including acting as a dietary calcium supplement, a firming agent, and an antacid in various food products. While it is predominantly sourced from non-animal origins, it can also be derived from eggshells or animal bones, making it important for vegetarians to verify its source with manufacturers.
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- Evidence-based. Diet compatibility ratings are compiled from peer-reviewed nutrition guidance, dietary association recommendations, and ingredient composition data.
- Continuously updated. Our ingredient database is refreshed as new sources and product data become available.
- Transparent uncertainty. When an ingredient's safety depends on serving size, preparation, or sub-ingredients, we mark it “caution” rather than forcing a binary answer.
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