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doi: 10.1038/nm.2492 278 PascualGAvgustinovaAMejettaSMartinMCastellanosAAttoliniCSet al
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
At the end of day 10, blood samples were drawn and liver and kidney tissues were removed
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