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This is often driven by social media claims that go well beyond what research supports
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
Chen R, Lee WC, Fujimoto J, Li J, Hu X, Mehran R, Rice D, Swisher S , Sepesi B, Tran H, Chow CW, Little L, Gumbs C, Haymaker C Heymach J, Wistuba I, Lee J, Futreal A, Zhang J, Reuben A Tsao A, Zhang J
Original Study Reference Pyo HK, Yoo HG, Won CH, Lee SH, Kang YJ, Eun HC, Cho KH, Kim KH
Mushroom poisoning: Retrospective analysis of 294 cases
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