Data from 25 studies that included more than 17,000 patients suggest higher levels of vitamin D may be linked to higher survival rates for patients with colon, breast or prostate cancer. The data showed that cancer patients had a 4% higher rate of survival when they had a 10 nmol/L increase in vitamin D levels compared with patients with lower levels, but researchers said it is unclear what dosage of the vitamin would be necessary to help cancer patients.

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