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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

The impact can be significant, both mentally and physically

This may delay your surgical date, and I will explain why

Leah K.Verified PurchaseMar 15, 2026 Five weeks in and friends have asked what I am doing differently