Now Calcium and Magnesium Powder supports optimal bone structure and helps with bone metabolism. The citrate forms of calcium and magnesium are highly absorbable and support not only strong bones and teeth but muscle and nerve function as well. Vitamin D3 is included to complement calcium and magnesium and its role in the maintenance of mineral homeostasis and bone structure. Recommended Use: Mix 1 1/2 level teaspoons of powder into at least 8 oz. of cold water or clear liquid. Add powder slowly while stirring. Take once daily with a meal, or as directed by a healthcare professional. Pure calcium and magnesium citrate powders can increase the temperature of liquids upon contact; therefore, the recommended serving MUST be mixed into at least 8 oz.of cold liquid to neutralize this reaction prior to ingestion.