vitamin b12 injection brand name Cyanocobalamin 1000 mcg Multiple-Dose Vials — Mountainside Medical Vitamin B12 Injection - 10mL

The severity and duration of your deficiency matters someone who's been low for years will take longer to fully recover than someone who's been trending down for a few months

It can take many years (approx 20) to develop a deficiency disease in those altering their diet to one lacking in B12 due to reabsorbtion however, if failure to absorb leads to B12 deficiency disease occur within a few years (3-4)

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A 2005 study concluded that oral vitamin B12 and intramuscular (IM) vitamin B12 have similar effects in terms of normalizing serum vitamin B12 levels.(7) The treatment and maintenance of a B12 deficiency largely depends on what has caused it