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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.
A. Vitamin B12 can be received in your diet through eating meats, eggs, milk and fish. The daily recommended daily requirement is set at 2.6 mcg. People that have a B12 deficiency may feel week, shaky, and experience mood disturbances. It is best to discuss your plan to take B12 as supplement with your doctor.nly about 10mcg. of a 500 mcg. dose taken orally is absorbed by the body.The next best form of B12 may be taken through pills that are dissolved under the tongue. If you decide on oral B12 supplementation, I recommend a dose of 1000 mcg. taken in sublingual form once per day.