B12 question

i have recently been feeling more tired and having less energy, so i went to my pcp for a checkup. he tested my B12 and the result was around 200. normal is 100-900, so he told me to take a multivitamin daily and have it rechecked in 4-6 months. of course, i have been taking my multivitamin religiously since 6mo before surgery (i am almost 1 yr postop RNY) and am wondering what your levels were when you started taking B12 and did you notice an improvement in activity immediately? i go for my 1 yr checkup next mo with my surgeon and am sure he will give me more info. but just curious from those of you that have experienced low B12. thanks in advance!! Holly

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