E-number E170

E170 is the food additive known as calcium carbonate, commonly used as a dietary calcium supplement, a white food coloring, or a buffering agent to maintain pH levels in processed foods. It naturally occurs in chalk, limestone, and marble. In foods, it helps improve texture and stability, such as in baked goods, dairy products, and beverages. Generally recognized as safe when used within regulated limits, calcium carbonate is also a source of dietary calcium, contributing to bone health. It is widely approved globally and commonly found in products like antacids and calcium-fortified foods.