E170: Calcium carbonates

What is E170?

Calcium carbonate is a common mineral compound made of calcium, carbon and oxygen, the main component of chalk, limestone and eggshells. Labelled E170, it is a fine, white, tasteless powder.

Origin and production

It is obtained by mining and grinding natural limestone or chalk, or by precipitating it chemically from a calcium solution to produce a purer form.

Why is it used?

Calcium carbonate acts as a white colour, anti-caking agent, acidity regulator and source of added calcium. It appears in breads and flour, cakes, snacks, chewing gum, protein bars and desserts, and in some countries is added to flour to fortify it with calcium.

Vegan, vegetarian and halal

Calcium carbonate used in food is usually of mineral origin and is suitable for vegans and vegetarians. It is not generally a halal or kosher concern.

Safety and regulation

Calcium carbonate is authorised as a food additive in the EU and may be used at the level needed for its purpose. EFSA re-evaluated it and did not consider a numerical acceptable daily intake necessary.

Common in