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Intrinsic factor antibodies and pernicious anemia Vitamin B12 A Vitamin B12 injection is a quick shot that gives your body vitamin B12 directly into the muscle. This helps your body absorb it faster than tablets. Vitamin B12 helps Gastric Intrinsic Factor & Vitamin B12 Binding Intrinsic factor is a key glycoprotein secreted by gastric parietal cellsessential for the absorption of vitamin B12 in the terminal ileum. Without it, even How do intrinsic factor antibodies cause falsely elevated vitamin B12 levels?
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