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How is vitamin B12 absorbed?

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In food, vitamin B12 is attached to a protein that must be removed in the stomach by gastric acid and an enzyme called pepsin. Once B12 is free, a binding protein attaches to it and protects it while it's transported to the small intestine. Once in the small intestine, a substance called intrinsic factor takes B12 from the binding protein and allows it to be absorbed into the blood, where it functions in promoting health.

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