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Most B12 in the UK is injected into muscle, but the fatty subcutaneous route is a recognised alternative
doi:10.1016/j.bmcl.2018.07.009
Store the mixed vial in the refrigerator and draw doses with an insulin syringe
NICE Clinical Knowledge Summaries recommend B12 injections for: Pernicious anaemia an autoimmune condition affecting intrinsic factor production Malabsorption syndromes including coeliac disease and inflammatory bowel disease Post-surgical states particularly following gastrectomy or ileal resection Strict vegan diets when oral supplementation proves inadequate, though oral cyanocobalamin is usually sufficient for dietary deficiency Clinical trials demonstrate that B12 injections rapidly improve haematological parameters and neurological symptoms when deficiency is confirmed through blood tests
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