Large study to examine if vitamin D prevents diabetes

Researchers have begun the first definitive, large-scale clinical trial to investigate if a vitamin D supplement helps prevent or delay type 2 diabetes in adults who have prediabetes, who are at high risk for developing type 2. Funded by the National Institutes of Health, the study is taking place at about 20 study sites across the United States.

http://medicalxpress.com/news/2013-10-large-vitamin-d-diabetes.html