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10.1111/j.0954-6820.1968.tb02452.x [DOI] [PubMed] 51.Chapman LE, Darling AL, Brown JE (2016) Association between metformin and vitamin B12 deficiency in patients with type 2 diabetes: a systematic review and meta-analysis
[DOI] [PMC free article] [PubMed] [Google Scholar] 2.Center for Disease Control and Prevention
"What effect does metformin have on vitamin B 12 levels?"
