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Description
In the UK, oral cyanocobalamin is the standard recommendation for dietary deficiency, whilst intramuscular hydroxocobalamin is preferred for pernicious anaemia or malabsorption

Human carboxylesterases: a comprehensive review
Biological plausibility exists but human evidence lacking
Even low-normal B12 levels can result in deficiency symptoms

Subcutaneous and intramuscular injections offer similar bioavailability

Does drawing blood hurt
