As a result, these medicines are typically administered via intravenous or intramuscular injection because feeding leads to low resistance to proteases (169)
Its often more cost-effective when doing long-term trials
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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
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[DOI] [PubMed] [Google Scholar] 79.Zekovic A., Damjanov N