The effect of vitamin D supplementation on the glycemic control of pre-diabetic Qatari patients in a randomized control trial.

Background: Vitamin D deficiency is associated with indicators of pre-diabetes including, insulin resistance, β-cell dysfunction and elevated plasma glucose with controversial findings from current trials. This study aims to investigate the long-term effect of vitamin D on glucose metabolism and insulin sensitivity in pre-diabetic and highly vitamin-deficient subjects.

Methods: One hundred thirty-two participants were randomized to 30,000 IU vitamin D weekly for 6 months.