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There should not be any swelling or bruising or other visible signs of the procedure after the redness subsides
Conclusions B12 injections are one of several prophylactic B12 options now available for those with altered gastric acidity and/or Intrinsic Factor
Oct 2014;57(3):333-9
For most people, the effects last about one to two weeks, though the exact timeline shifts based on your current B12 levels, metabolism, diet, and how often you get injections
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