← 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, and it can also be sourced from oyster shells. Its halal status is generally considered unquestionable because it is an inorganic mineral, not derived from animals, and is therefore accepted as halal by major certification bodies like JAKIM, MUI, and MUIS. Even when obtained from oyster shells, the extensive processing and purification remove any impurities, leading most scholars to classify it as halal.