Powdered milk contains a host of vitamins such as A, D, E and K. According to the U.S. Dairy Export Council, vitamin A is beneficial for your immune system, reproductive system and vision and aids in cellular growth and differentiation. Vitamin D helps your intestines absorb phosphorous and calcium, which aids the bones, joints and heart. Vitamin E is a powerful antioxidant that protects lipoproteins and cell membranes as well as stimulating your body's immune response to disease. Vitamin K is important for proper blood clotting.