Why Vitamin D?
Aside from building strong bones, vitamin D seems to play a role in the way cancer develops. Vitamin D appears to reduce the incidence of many types of cancer by inhibiting angiogenesis–the formation of new blood vessels that are essential for tumor growth–and by inhibiting the division of epithelial cells that line the breast. Because few foods are good natural sources of vitamin D, most vitamin D comes from fortified foods such as dairy products, breakfast cereals and orange juice. The rest comes from dietary supplements and sun exposure, which triggers the skin to produce vitamin D.
