According to researchers at the University of California-San Diego Moores Cancer Centre, a daily dosage of 1,000 international units of vitamin D can lower the risk of breast and ovarian cancers by up to one-third. Researchers closely examined 63 previous studies that examined the association between vitamin D and cancer. Of the 63 studies, 13 involved research on breast cancer, and seven studied ovarian cancer. The majority of the studies did find that vitamin D had a protective effect over cancer risk.
Overall, researchers conclude that efforts to improve vitamin D status through supplementation could reduce cancer incidence. However, further studies are needed to demonstrate the exact mechanism by which vitamin D reduces the cancer risk.
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