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It may be that the process of testing for pernicious anaemia is being overlooked and that interval tests are not being done for borderline cases with minimal/non-specific symptoms
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For most people, expect about one to two weeks of noticeable effects, with the exact timing shaped by your levels, metabolism, diet, absorption, and age
So if you regularly include these foods in your diet, you may want to get your MMA levels checked instead of your active vitamin B12 ones
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