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Absent intrinsic factor is often associated with a condition called atrophic gastritis, a thinning of the lining of the stomach
Iron , on the other hand, is key for hemoglobin production and oxygen transport
Post-Surgery Patients People whove had gastric bypass or small intestine surgery may require B12 shots because their bodies can no longer absorb the vitamin effectively through food or oral supplements
PMID 37060552
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