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Vitamin D3 is necessary for the utilization of Calcium and Phosphorus, and for the assimilation of Vitamin A. It also has a strong immune enhancing effect.
Recently, it was found that around 40-50% of the American population is Vitamin D deficient. Vitamin D is produced in the skin by exposure to sunlight and is added to milk and other dairy products.
In the tropics, where sunshine makes Vitamin D deficiency rare, osteoporosis, cataracts, colon and prostate cancer are far less common.
Vitamin D3 appears to be more closely related to a hormone than a vitamin because of the many cellular functions it performs. Among its actions is the regulation of cellular proliferation and differentiation.
Vitamin D3 works synergistically with Vitamin A to control cancer by inducing certain cancer cells to differentiate into normal cells and to stop multiplying uncontrollably. This effect is so pronounced that drug companies are working on patentable analogs for cancer therapy.
Among the cancers that Vitamin D3 has been shown to be effective against are colorectal, breast, prostate, ovarian, and several kinds of leukemia and lymphoma.
Vitamin D3 and its metabolites are currently being studied by researchers worldwide for cancer prevention and treatment. The anticancer mechanisms of D3 are different from the antioxidant and antimutagenic effects of other nutrients that may prevent cancer.