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doi:10.1161/CIRCULATIONAHA.121.054823

As indicated by the observations of Heyworth-Smith and Hogan [85], it seems likely that allergy to one chemical form of vitamin B12 may predispose to allergy to other forms of this vitamin at a later time
doi: 10.1021/acschemneuro.5c00484 82 FonsecaL

Gastrointestinal Disorders: Conditions like Crohns disease or celiac disease can interfere with B12 absorption