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One, it may well be that levels of serum B12 in the blood gradually decrease when treatment is stopped, but still remain within the low-normal range for several months or even a few years
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Cyanocobalamin injections are often prescribed to gastric bypass patients who have had part of their small intestine bypassed, making it difficult for B 12 to be acquired via food or vitamins
References Heffernan MA, et al
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