To assess the incidence of vitamin D deficiency in patients receiving OHA, with comparison of metformin vs non-metformin groups

This is the authors' abstract. We don't add key points for this paper.

If gastrointestinal symptoms from metformin use can create an environment conducive to the malabsorption of vitamin B12, it Is probable that vitamin D could also be malabsorbed. This could adversely affect treatment efficacy as well as expose certain patient populations to the risk of symptoms of vitamin D deficiency. Currently, no published studies have examined the effect of metformin on vitamin D levels in a population of patients with diabetes. Hence, this study focuses on the incidence of deficiencies of vitamin D in patients with type 2 diabetes on treatment with metformin (Biguanide) and compare with those on other OHAs.