- Rich Source of Calcium.Adequate 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. NOW Bone Meal Powder is tested for heavy metals such as lead and aluminum to assure the lowest levels possible.Natural color variation may occur in this product.