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For many patients, their injections dont last long enough Some clinicians assume (incorrectly) that 1000 mcg of B12 should last patients at least 200 days, calculating from a 5 mcg daily requirement for the vitamin
Most people get enough vitamin B12 by eating a variety of foods
This is particularly important for individuals with conditions that interfere with B12 absorption, such as pernicious anemia, gastrointestinal disorders like celiac disease or Crohns disease, or those who have undergone certain types of gastrointestinal surgery
While there is no evidence that B12 can provide an energy boost in those with healthy levels of the vitamin, increased levels of B12 in those with a deficiency may improve symptoms of fatigue
