Rationale and design of the Vitamin D and Type 2 Diabetes (D2d) study: a diabetes prevention trial.

Diabetes Care · 2014 · PMC4237973 · PMID 25205139

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nearly statistically significantno p-value reported

In the Calcium and Vitamin D for Type 2 Diabetes Mellitus study, vitamin D supplementation (4,000 IU/day) in adults at risk for type 2 diabetes ( n = 92) improved β-cell function, as assessed by a frequently sampled intravenous glucose tolerance test, and achieved a nearly statistically significant reduction in hemoglobin A 1c ( 11 ).

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