An enhanced immune performance at transition is one of four ways in which vitamin A helps dairy cattle. The other three are enhanced respiratory, digestive, and reproductive performance. Vitamin A, an essential nutrient, is stored in the liver and released according to the needs of target organs. The world’s most bioavailable vitamin A product Microvit® A Supra Ruminant is stable in premixes and pelleted feeds and becomes 100% available in the small intestine for absorption and use by the dairy cow. Its introduction changed the market standard.