Cal-Boost is a supplemental source of calcium for dairy cows during the demanding period of freshening. It contains immediate-release calcium and sustained-release calcium plus vitamin D which is necessary for the absorption and metabolism of calcium and phosphorus. Active Ingredients Calcium chloride - 107 g Calcium sulfate - 46 g Vitamin D3 - 50,000 IU Inactive Ingredients Water Hydrogenated Soybean Oil Coconut Oil