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The B12 blood test involves a simple blood draw, typically from a vein in your arm
It's not always the case, but I would have expected something as well as an unmeasurable B12
I was originally diagnosed with B12 deficiency years ago and without B12 my symptoms come back, but trying to convince my GP I need them just makes me look like a nutcase as my levels are sky high because of the injections
[1] [2] Factors That Affect How Fast B12 Injections Work Multiple variables influence how quickly you will respond to B12 injection therapy, making it difficult to predict an exact timeline for any individual patient
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When you don't have enough B12, the whole production process sputters and breaks down
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