Vitamins A, D, and C are essential to the health of the body. Adequate levels of tivamin A are important for good eyesight and vitamin A is necessary for proper function of the immune, sekeletal reproductive, respiratory, and integumentary (skin) systems. Vitamin D is essential for healthy bones and teeth. Vitamin D is also essencial for growth. Vitamin C is involved in the biosynthesis of collagen and other connective-tissue components, helps to regulate iron absorption, and has excellent antioxidant properties.