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Researchers have found that daily intakes of vitamin D by adults in the range of 4000-8000 IU are needed to maintain blood levels of vitamin D metabolites in the range needed to reduce by about half the risk of breast cancer, colon cancer, multiple sclerosis, and type 1 diabetes.
While an Institute of Medicine committee has stated that 4000 IU/day is a safe dosage, their recommended minimum daily intake is only 600 IU/day.
According to the study in the journal Anticancer Research: