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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.
There is really no accurate way of measuring exactly how long it will take for vitamin B12 to help your body build new red blood cells, begin healing damaged nerve cells, or boost energy levels.f you begin early on, then you should start seeing results from vitamin B12 before long, depending on how much vitamin B12 you need in order to achieve a normal level.