The "Doggy’s + Liver" supplement for dogs contains calcium, which is necessary for the structural integrity of bones, the contraction of all muscles (including the heart), transmission of nerve signals, blood clotting, and the health of cell membranes and nutrient transport. Phosphorus is part of bone, nerve, muscle, and glandular tissue cells, and plays a key role in energy processes for sustaining life. Magnesium supports the health of all body tissues and the enzymatic systems involved in the metabolism of carbohydrates, fats, and proteins, as well as the metabolism of calcium, phosphorus, sodium, potassium, and vitamin C. Quantity: 75 tablets