Now Calcium Carbonate Powder 12 oz. is a supplement containing one of the highest concentrations of elemental Calcium available. Its high Calcium content makes it an excellent form for the support of healthy bones and teeth. Recommended Use: Take 1/2 level teaspoon daily, preferably with a meal, or as directed by a healthcare professional. For best results, blend into "pulpy" type juices such as tomato or orange juice. Store in a cool, dry place after opening.