Description Calcium Carbonate, also known as limestone, is perfect for adding to your fermentation to increase firmness. Calcium carbonate is often used as a dietary supplement or to increase calcium content in foods. It can also be used to regulate acidity. Other Details Dietary Attributes: Plant-Based, Non-GMO, Gluten-Free, Kosher (OU), Keto-friendly Ingredient List: Calcium Carbonate Allergen(s): None Dcoumentation: Spec/SDS/COA/Misc