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Similar clinical symptoms are found in individuals with hereditary IF deficiency (also called congenital pernicious anemia) in whom the lack of IF results in the defective absorption of vitamin B 12
You may have to take it once or twice a week depending on your condition your nutritional balance
Medications that reduce absorption of B12 metformin (for diabetes) and antacids (that reduce the amount of stomach acid) are the main ones
Certain health conditions If you have a stomach or small intestine condition such as celiac disease or Crohn's disease, you may not be able to absorb enough vitamin B12 from food
[DOI] [PMC free article] [PubMed] [Google Scholar] 144.Jenkins-Kruchten AE, Bennaars-Eiden A, Ross JR, Shen WJ, Kraemer FB, Bernlohr DA
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