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Both injection types are far more effective at raising B12 levels than oral supplements, but the best method really depends on your individual needs
[1] Onset of deficiency may take years to develop
Chloramphenicol should be discontinued if anemia attributable to chloramphenicol is noted during periodic blood studies, which should be done approximately every 2 days during chloramphenicol receipt
Elderly people may also be deficient, as the ability to absorb vitamin B12 decreases with age
Feeling tired for a short while : Often settles after resting
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