This is an exfoliant with absorbent properties, sometimes used to make food and cosmetics whiter. It is also used as a filler in deodorants. It is the prime ingredient in Tums and serves as a gastric antacid and diarrhear medicine. Eggshells are made of 95% calcium carbonate.
Calcium carbonate is not an irritant or an allergen.
It is also known as chalk.
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