The lack of intrinsic factor is most commonly due to autoimmune gastritis, which causes an autoimmune attack on the parietal cells that create it in the stomach
People with pernicious anemia often take 1000 to 2000 mcg of oral vitamin B12 daily
Consult your physician if you have Lebers optic neuropathy, polycythemia, gout, iron or folic acid deficiency anemia or hypokalemia
Understanding when and how to take B12 supplements can help optimise treatment outcomes, particularly for individuals with deficiency or malabsorption conditions
However, there are no well-controlled studies in pregnant women, so this medication is generally recommended during pregnancy only when clearly needed
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