Imagine incorporating an inexpensive, single supplement into your life that promises to strengthen your bones, thwart different forms of cancer, stave off multiple sclerosis and autoimmune disorders and fight infections. New research into the preventive benefits of vitamin D has raised hopes that the sunshine vitamin, which is produced naturally in the body through exposure to the sun’s ultraviolet rays, could extend and improve people’s lives, CBC News Online reports. The best sources of vitamin D from food are: Milk — 1 cup: 100 International Units (IU); fortified rice or soy beverage — 1 cup: 100 IU; salmon canned, pink, — 3 oz: 530 IU; and tuna canned, light, — 3 0z: 200 IU.