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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.
Report Abuse. Plasma volumes will return to normal in around 24 hours, while red blood cells are replaced by bone marrow into the circulatory system within about 3-5 weeks, and lost iron replaced over 6-8 weeks. This process can be speeded by eating foods high in complex carbohydrates, iron, and other trace minerals. had surgery 6 mths ago and loss quite a bit of blood. When I went in this week for a follow up surgery my hemaglobin level was a 6.4. They cancelled the surgery and rescheduled it for 4 weeks from now. I am taking iron supplements and do not know if it is going to be enough to be ready for surgery. Add your answer.