Natural Calcium Source Rich Source of Calcium GMP Quality AssuredAdequate calcium throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis.NOW Bone Meal Powder is naturally derived from cattle raised in the United States. Bone Meal Powder is an excellent source of Calcium. Calcium in bone meal occurs as a natural calcium phosphate compound known as hydroxyapatite. Our sterilized and sanitary NOW Bone Meal Powder is tested for heavy metals such as lead and aluminum to assure the lowest levels possible.Provides approximately 900 mg of calcium per serving.