Without intrinsic factor, vitamin B-12 can't be absorbed and leaves your body as waste.
CNN: Vitamin deficiency anemia
Vitamin B-12 deficiency anemia caused by a lack of intrinsic factor is called pernicious anemia.
The protein is a growth factor that leads to the production of certain immune cells, called B-cells.
FORBES: Health Care
However, a vitamin B-12 deficiency is most often due to a lack of a substance called intrinsic factor.
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