Fig. 4From: Determinants of vitamin B12 deficiency in patients with type-2 diabetes mellitus — A primary-care retrospective cohort studyScatterplot of serum B12 levels and their corresponding daily metformin doses (g/day) (n = 592). This shows the mean serum B12 levels (with 95% confidence intervals) of patients decreasing consistently as they take higher daily doses of metforminBack to article page