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You might have low B12 levels if you eat a vegetarian or vegan diet, have taken metformin for a long time, or have a gastrointestinal disorder

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Can a person have too much vitamin B12 or folate

Discussion Significance of the study To our knowledge, this is the most comprehensive network meta-analysis comparing the efficacy of SL, IM, and oral routes of administration of vitamin B12 in patients with vitamin B12 deficiency