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There are several methods to treat vitamin B12 deficiency (VB12d): intramuscular (IM), oral, sublingual (SL), and intranasal vitamin B12 (VB12) preparations. Large studies comparing the efficacy of SL vs. IM supplements are lacking. The aim of the present study was to compare the efficacy of SL versus the standard IM administration of VB12 in restoring B12 levels. This was a retrospective analysis...