Vitamin B12 is absorbed through two pathways. The first is intrinsic factor, a protein produced by parietal cells in the stomach. IF binds B12 in the small intestine and carries it across Vitamins After Gastric Bypass: Gastric Bypass Malabsorption Guide Medical Indications or Conditions that Require Vitamin B12 (Cobalamin) supplementation How Long Does a B12 Injection Last? UK Treatment Guide Bolt Pharmacy
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