← Ingredient & E-number explorer

Typical source

Mineral (limestone)

Plain-language explanation

E170, or calcium carbonate, is a common mineral found in rocks like limestone and marble, or sourced from shells and coral. It is used as an anti-caking agent and white food coloring. This ingredient is generally considered halal by all major certification bodies because its mineral source is not of animal origin. However, if it is derived from oyster shells, some stricter interpretations may require verification to ensure no non-halal processing was involved.