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Re: vitamin b12 deficiency how long will it take to get better. I just posted some new results. My b12 was 311. Doc said it was normal (in the normal range) and in six months of taking sublingual tabs two times a day (1000) it went up to 914.e: vitamin b12 deficiency how long will it take to get better. Steph--Your B-12 is where it should be. I run between 800 without supplements and 900 with. I have read twice lately where people have said that their doc wants them to be over 800 not 200 that we all have heard so many times.
As with most shots, a B12 shot is injected directly into a patient's muscle, usually in the thigh or upper arm. For individuals with a vitamin B12 deficiency, the usual shot dosage is 1,000 micrograms, according to the Mayo Clinic.This may be given daily for 10 days, and then once per week for four weeks.lder adults and people with certain conditions, however, may be unable to absorb dietary B12. Such individuals may be prescribed a vitamin B12 shot in order to prevent deficiency. Additionally, vitamin B12 injections are sometimes prescribed as energy boosters.