"An ever growing number of studies show that vitamin D has tremendous protective effects against a variety of different cancers, including pancreatic, lung, ovarian, breast, prostate, and skin cancers. Theories linking vitamin D deficiency to cancer have been tested and confirmed in more than 200 studies, and understanding of its physiological basis stems from more than 2,500 laboratory trials."
As a general guideline, adults need about 8,000 IUs of Vitamin D every day.
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Vitamin D Deficiency