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There are no known cases of poisoning or overdose symptoms.

Vitamin B12 deficiency is frequently linked to: malabsorption disorders, severe malnutrition, some inherited imbalances in absorption, exocrine pancreatic insufficiency (EPI), chronic gastrointestinal disease and intestinal dysbiosis

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Sikiri, P., Mazul, B., Seiwerth, S., Grabarevi, Z., Rucman, R., Petek, M., Jagi, V., Turkovi, B., Rotkvi, I., Mise, S., Zorici, I., Jurina, L., Konjevoda, P., Hanzevacki, M., Gjurasin, M., Separovi, J., Ljubanovi, D., Artukovi, B., Bratuli, M., Tisljar, M., Sumajstorci, J

Some GPs may incorrectly believe that only patients with a definite diagnosis of PA, those with a positive intrinsic factor antibody test, require treatment for life so seem to be using this as their treatment exclusion criteria