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What Dose of Oral Vitamin D Do You Need to Prevent Cancer?

Researchers have reported that a much higher intake of vitamin D is needed to reach blood levels that can prevent breast cancer and other major diseases than had been originally thought.

They 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:

“The supplemental dose ensuring that 97.5 percent of this population achieved a serum 25(OH)D of at least 40 ng/ml was 9,600 IU/d ... Universal intake of up to 40,000 IU vitamin D per day is unlikely to result in vitamin D toxicity.”

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