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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.
More recent studies put the ideal intake at 4-7 mcg per day. (Click for more info on optimum levels .). The trouble is our bodies don't absorb all of the B12 we take, and there's kind of a cap on how much we absorb at one time.(Click for more info on how to calculate our body's absorption rate.The ideal would be to take smaller doses throughout the day.ore recent studies put the ideal intake at 4-7 mcg per day. (Click for more info on optimum levels .). The trouble is our bodies don't absorb all of the B12 we take, and there's kind of a cap on how much we absorb at one time.