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Key Takeaways Bariatric surgery significantly alters how well your body can absorb vitamin B12 Being deficient in vitamin B12 over an extended period can lead to irreversible damage Finding a supplement with a vitamin B12 dose that meets your needs after bariatric surgery is essential Vitamin B12 deficiency is common after bariatric surgery and, if not corrected, can cause serious complications to your red blood cell production, cognitive health, and nervous system

Yes, it matters significantly, especially for small doses

[DOI] [PMC free article] [PubMed] [Google Scholar] 19.Hofbauer KG, Nicholson JR, Boss O

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The NHS advises that taking up to 2 mg (2000 micrograms) daily in supplements is unlikely to cause harm