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Maintenance therapy is intramuscular (1,000 g every month) or oral vitamin B12 1,000 g daily.9,12 Conclusion Metformin-associated vitamin B12 deficiency is preventable

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What Are the Side Effects of B12 Shots vs IV Infusions

30 A 2021 meta-analysis on the effects of B12 on cognitive function found no benefit with either B12 alone (based on four RCTs) or B12 combined with other B vitamins (based on 13 studies)

They are simply different routes

(You may have to accept the AMA License Agreement.) Look for a Billing and Coding Article in the results and open it
