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Strengthen your vitality
Editorial Advisory Board Member, Harvard Health Publishing What harm can having too little of vitamin B 12 do
After ingestion, stomach acid separates B12 from food proteins, and then intrinsic factor produced in the stomach lining binds to B12 so it can be absorbed in the ileum (the final section of the small intestine)
Conditions that affect the stomach lining, such as atrophic gastritis, reduce intrinsic factor production
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