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observed patients after two years of bariatric surgery, who were systematically taking multivitamins containing 2.4 g of vitamin B 12 , that 80% of their patients had a deficit and had to be supplemented [54]
In addition to excessive intake of dietary supplements, parenteral administration of vitamin B12 may be another cause of excess, which is likely associated with an immune system response to produce anti-TC II antibodies
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