But its absorption requires presence of gastric intrinsic factor
(IF) which is secreted by the parietal cells.
This belief is still being propagated, as this quote from an article published recently attests: "Pernicious anemia is caused by inadequate secretion of gastric intrinsic factor
necessary for vitamin [B.
Conservative estimates indicate that 2-3% of this population has, or will develop, pernicious anemia, caused by failure of gastric intrinsic factor
production, resulting in B12 mal-absorption.