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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.
Definition. Vitamin B12 helps in red blood cell formation, production of DNA, and function of the nervous system. Vitamin B12 deficiency can occur when the body needs more vitamin B12 than it receives from the diet. Alternatively, the condition may occur when the body is unable to use the vitamin B12 from the diet.A shortage of vitamin B12 can lead to anemia.itamin B12 helps in red blood cell formation, production of DNA, and function of the nervous system. Vitamin B12 deficiency can occur when the body needs more vitamin B12 than it receives from the diet.