Ingredient

Is Calcium Carbonate Real Food?

Approved

Calcium carbonate is a common mineral found naturally in rocks, seashells, and pearls. In food production, it's often sourced from finely ground limestone or oyster shells.

Why it’s in your food

The manufacturer’s reason.

Manufacturers use calcium carbonate as a dietary supplement for calcium fortification, as an anti-caking agent, and sometimes as a firming agent in foods.

Community scan data

How it shows up in the wild.

Found in 6 productswe’ve analyzed.

6

Rated Clean

0

Caution

0

Flagged

Where to find it

Products containing Calcium Carbonate.

6 products in our database.

ANNIE'S, INC.

Annie's Organic Cocoa Puffs Cereal

Flagged

Good ingredients with a few modern touches.

CEREAL7/11 clean · 3w ago

ANNIE'S, INC.

Bunny Grahams

Approved

Mostly good ingredients with a few modern additions.

CRACKER14/18 clean · 3w ago

Unknown

Cereal

Flagged

Artificial colors and enriched flour are no good!

CEREAL14/23 clean · Apr 20, 2026

TRADER JOE'S

Vanilla Ice Cream Chocolate Wafer Cookies

Flagged

Enriched flour and carrageenan make this dessert suspect.

FROZEN27/40 clean · 1w ago

THE QUAKER OATS COMPANY

Granola

Flagged

Too many processed ingredients for Nonna!

SNACK BAR12/21 clean · Apr 20, 2026

General Mills Sales, Inc.

Cheerios (likely Original)

Flagged

Industrial syrup and artificial color in your cereal!

CEREAL19/24 clean · Apr 15, 2026

FAQ

Frequently asked questions.

What is Calcium Carbonate?▾
It is a chemical compound with the formula CaCO3, a salt of calcium and carbonic acid. It's a fundamental component of many common materials like limestone, chalk, marble, and eggshells.
Can Nonna find Calcium Carbonate in her kitchen?▾
While Nonna wouldn't have a jar labeled 'calcium carbonate,' she would encounter it in everyday items like eggshells or even in the mineral content of her tap water. It's a very basic and natural compound.
Why is Calcium Carbonate added to food products?▾
It's primarily added to foods to boost their calcium content, helping people meet their daily nutritional needs. It can also act as an anti-caking agent to prevent powders from clumping, or as a firming agent in canned vegetables.

Check your own pantry.

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