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PMID 23629538
This does not prove treatment of insulin resistance or diabetes in people
Allergic reaction , rare but possible, particularly to the cobalt component of cobalamin
Patients usually have a mix rather than just one
For those with a genuine, diagnosed B12 deficiency causing their fatigue, improvements can sometimes be noticed within a few days to a week
Unlike oral medications, which must travel throughout the body before taking effect, injections act locally and quickly
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