Calcium Carbonate powder by BulkSupplements.com is one of the selections of our mineral supplement. This mineral supplement provide daily calcium intake in your diet. Each serving of this calcium supplement contains 1250mg of Calcium carbonate (500mg of Calcium) which is about 1/2 tsp, and may need a milligram scale to measure. Contents of this product is sold by weight, not volume and settling may occur. And, we also sell it different sizes ranging from 100g to 5kg in resealable bags Our Calcium carbonate powder, or calcium supplement, is pure, clean, and does not contain any filler, additives and artificial flavors. And this calcium supplement, or calcium 500mg powder, is dairy free, soy free, yeast free, no added sugar. All products by BulkSupplements.com are manufactured according to cGMP Standards to ensure the highest quality for manufacturing, packaging, labeling, and holding operations. We work with a third-party laboratory that test our products at multiple stages during production, from raw material to finished products, and ensures compliance, standards, and consistency.