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Conclusion Whilst severe B12 deficiency has a clear clinical picture with characteristic haematological and/or neurological features, establishing mild or borderline deficiency can be problematic as serum levels are maintained at the expense of tissue concentrations, and therefore serum levels of B12 may be in the low normal or borderline range despite a deficiency
When vitamin B12 is in the off position, your body is not able to use it to break down or create other chemicals (like amino acids and proteins) needed to keep your nerves and neurons healthy
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