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Dietary causes It is unusual to lack vitamin B12 if you eat a normal balanced diet
Retrieved from ScienceDirect
Hydroxocobalamin is the standard UK preparation, administered intramuscularly for conditions like pernicious anaemia and gastrointestinal malabsorption B12 acts as a cofactor in DNA synthesis, red blood cell formation, and nervous system function, supporting energy metabolism pathways Common side effects include injection site reactions, mild gastrointestinal upset, and temporary urine discolouration, with serious reactions being rare NHS access requires GP assessment with blood tests
Their packaging may include disposable needles that are attached to the pen
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