NV Calcium-Phosphorus w/Vitamin DNaturvet Calcium Phosphorus with Vitamin D Calcium Phosphorus For Dogs Powder supplies essential minerals for building and maintaining strong and healthy bones. Vitamin D (a fat soluble vitamin) is necessary for proper absorption and balance of calcium and phosphorus. Great for puppies or large growing breeds who may need extra calcium. For use in dogs over the age of 12 weeks. NASC, GMP Compliant, Manufactured in the USA INGREDIENTS: Dicalcium