ADEK are fat soluable vitamins that help with many different areas of the body. Vitamin A is good for for normal vision, the immune system, and reproduction. Vitamin A also helps the heart, lungs, kidneys, and other organs work properly. Vitamin D is a vitamin most people are deficient in, it is good for the bones, skin, and immune system. Vitamin E acts as an antioxidant, helping to protect cells from the damage caused by free radicals. Free radicals are compounds formed when our bodies convert the food we eat into energy. Vitamin K is also good for bones, it also helps blood to clot.