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Fortunately, you cannot overdose on vitamin B12, as it is water-soluble, so adding more is not harmful
[36] Antibodies to intrinsic factor and parietal cells cause the destruction of the oxyntic gastric mucosa, in which the parietal cells are located, leading to the subsequent loss of intrinsic factor synthesis
Common reactions may include pain, redness, or irritation at the injection site, mild diarrhea, nausea, itching, headache, dizziness, or a general feeling of swelling
The duration that a B12 injection remains effective in your body depends primarily on which formulation you receive
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