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Malabsorption due to digestive disorders, such as Crohns disease or celiac disease, can also lead to vitamin B12 deficiency
Significant allergic reactions, though rare, require stopping use and potentially seeking medical attention
GI changes (constipation or diarrhea) are more often linked to B12 deficiency or underlying gut conditions that also impair B12 absorption
Jimnez-Reina, L., Caete, R., de la Torre, M
is contracted via the University of Groningen (no personal payment) to undertake consultancy for Novo Nordisk, Eli Lilly and Boehringer Ingelheim
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