Results from a case-control study, published in a paper by Cattaruzza et al., showed a clear decrease in melanoma risk as vitamin D levels increased. The study included 137 cases of melanoma (blood samples collected at the time of diagnosis) and 99 healthy controls. Results were statistically significant and suggest that a majority of melanoma cases can be prevented with vitamin D levels of 30 ng/ml (75 nmol/L) or above.
The study concluded the following:
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