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Vitamins & Immune Support Supplement PowderVet FormulatedFor Pets In Need Of Extra Calcium For Strong BonesGreat For Puppies and Large Growing BreedsNASC Quality Seal - National Animal Supplement CouncilVeterinarian formulated for use in dogs over the age of 12 weeks. Calcium and Phosphorus supply essential minerals for building and maintaining strong healthy bones. Vitamin D (a fat-soluble vitamin) is necessary for proper absorption and balance of Calcium and Phosphorus.