b12 injection bleeding Pernicious Anemia: Definition, Symptoms, Causes & Treatment Vitamin B12 and ulcerative colitis:

Gastrointestinal conditions Some gastrointestinal conditions may affect how vitamin B12 is digested or absorbed, such as: history of gastrointestinal surgery celiac disease Crohns disease pernicious anemia infections, such as from Helicobacter pylori bacteria or parasites pancreatic insufficiency or cancer bowel cancer folic acid deficiency small intestinal bacterial overgrowth Vitamin B12 injections may be more helpful for people with gastrointestinal conditions than oral products

While safety monitoring was comprehensive, the trials were not specifically designed to detect rare adverse effects that might occur at rates lower than 1-2%, which would require much larger participant numbers

Ethics declarations Conflict of interest The authors declare that they have no conflict of interest

Another reason you might opt for vitamin B12 injections over oral supplements: B12 injections are required less frequently than oral supplements

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