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How long before b12 kicks in

  1. Apr 18, 2008 #1


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    I have had my third injection but feel no difference, is this just long term?
  2. jcsd
  3. Apr 18, 2008 #2
    You should feel the effects in about 20 minutes of the injection. I never felt much from B12 shots either, but now I do take multi-B tablets about 3 hours into my shift at work. I find it helps me, makes a noticable difference in how I feel the rest of my day.
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