I actually am in the same boat as you - vitamin B-12 deficiency. Although mine is very severe and coupled with anemia. I just finished a round of tests with a gastroenterologist to see if it was a malabsorption issue, but it turns out my guts are fine. Now I have to trek off to see a hematologist - yay more tests :|
In the mean time though, I am taking a multivitamin with a ton of vitamin B-12 (can't remember the exact amount), but I have to add an iron supplement based on yesterday's doctor's orders.
Odd, but unlike some of the other posters, I don't really feel a difference when I'm taking the vitamins or not.
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