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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.
Thus removal of only 2 ml of blood results in the loss of 1 mg of iron3. If 450 ml of blood are taken in a donation approximately 225 mg of iron will be lost. If the donor has no iron deficiency, the erythrocytes and the haemoglobin level will generally return to normal within 34 weeks. Hence adequate iron stores are very important in maintenance of the donor health4.