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Chapman LE, Darling AL, Brown JE (2015) The association between the biguanide drug metformin and vitamin B 12 deficiency in diabetic patients: a systematic review

Despite the absence of a statistically significant doseresponse relationship observed in this analysis, clinical decision-making should consider that absorption efficiencyrather than absolute dosagemay be the limiting factor

They can assess your symptoms and adjust treatment if necessary

(PubMed) Eskes TK

In such cases, the focus should shift to investigating potential underlying causessuch as myeloproliferative disorders, liver disease, or renal dysfunctionrather than attributing symptoms to the elevated B12 itself

These above two areas are the major functions B12 is used for