Vitamin B12 deficiency and diabetic neuropathy in patients taking metformin: a cross-sectional study.

Objective: Vitamin B12 deficiency resulting from metformin use has been demonstrated in multiple studies. In this study, we aimed to evaluate the prevalence of vitamin B12 deficiency in patients with chronic metformin use and the relationship between vitamin B12 deficiency and diabetic neuropathy.

Methods: A cross-sectional study was conducted with 162 patients.