Ingredient
Calcium Carbonate
Scout's take
Naturally mined mineral abrasive — typically a clean, beneficial ingredient. However, Lead Safe Mama 2025 testing implicates the calcium carbonate (along with the hydrated silica) as a likely source of the 240 ppb lead and 40 ppb arsenic contamination in this product. Mined minerals can carry trace heavy metals depending on the source.
The case against
Low bioavailability compared to chelated calcium forms.
from the analysis of Pure Protein Protein BarsThe case for
Provides supplemental calcium for bone health.
from the analysis of Pure Protein Protein BarsMore from Scout's analyses
Calcium carbonate is used as a calcium supplement and food additive. It is a common source of calcium in fortified foods. While it helps increase calcium intake, it is less bioavailable compared to other forms like calcium citrate.
from the analysis of Cascadian Farm Organic Purely O's cereal boxCalcium carbonate is a common dietary supplement used to increase calcium intake. It is often added to foods to fortify them with calcium. It is generally considered safe but may cause digestive issues in some individuals.
from the analysis of 365 Everyday Value Organic honey nut morning o'sGentle natural mineral abrasive that physically polishes plaque off enamel and contributes free calcium ions to the oral environment. Cleaner than silica + titanium dioxide blends found in newer formulations.
from the analysis of Colgate Cavity Protection Great Regular Flavor ToothpasteFound in 23 products
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