Research shows that around 50 percent to 60 percent of ingested vitamin B12 is usually absorbed when enough intrinsic factor is present in relation to B12, but absorption decreases drastically when this ratio changes
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monitor their levels, says Miller, since pernicious anemia is especially prevalent in the elderly
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high-dose oral B12 can be effective for many causes of deficiency Sublingual (under the tongue) preparations : Though marketed as having better absorption, evidence does not show clear advantages over standard oral tablets Intramuscular injections : Prescribed for those with absorption problems or severe deficiency
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