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Research suggests different mechanisms of action between these compounds
This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation
This medicine may cause serious damage to the optic nerve (the nerve that connects the eye to the brain) in these individuals
PMCID: PMC2749291
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