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AIM The present study aimed to evaluate the combined effect of both dose and duration of metformin therapy on vitamin B12 levels in patients with type 2 diabetes mellitus (T2D). METHODS We recruited 2887 patients with T2D between January 2018 and November 2019 and categorized them into two groups (metformin and non-metformin users) matched for age, mean duration of diabetes, and BMI. We calculated the "Metformin Usage Index" (MUI) which was defined as the product of the dose of metformin (mg) used and its duration divided by 1000. Vitamin