= Full article availableAbstract
A review of 63 observational studies of vitamin D and cancer concludes that boosting daily intake to 1,000 international units (IU) might reduce the risk of colon, ovarian, breast and possibly prostate cancer. That’s more than the current Institute of Medicine recommendation for vitamin D, which ranges from 200–600 IU daily depending on age, though only half the safe upper limit set by the institute. Because it’s difficult to get that much vitamin D from food alone, this target can likely be best achieved through supplements, according to study co-author Cedric F. Garland, DrPH, of the University of California.
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