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A 2012 case study published in the New England Journal of Medicine describes a 62-year-old man who came into hospital with suspected pernicious anemia and was found to have low levels of vitamin B12
That said, all protocols start with a full medical screening to confirm theyre appropriate for your specific health profile
So, if your vitamin B12 deficiency is due to an autoimmune disease in which your stomach doesn't make intrinsic factor, supplements might not work for you, and you will need injections
Can age or health problems slow down how fast B12 works
Several situations raise the odds that B12 is part of the picture
Pernicious anaemia is the most common
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