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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

Its use is recommended under the guidance of experienced professionals, strictly for experimental and investigative purposes

This is crucial for patients who cannot absorb B12 through normal dietary means

doi: 10.3390/biom15020173