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How often should a person get b 12 shots. Got one today because I was so tired all the time.
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1620257 tn?1306321772
How can a shot take 3 months to kick in?

How does this work; it makes no sense?!
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1494818 tn?1362668058
I also get a B12 show every month.  It takes around 3 months to kick in, then you start feeling the difference.
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Avatar universal
From what I understand, this can vary from person to person.  I take a B12 injection every month.  I have heard of people needing them every two weeks.  Mine was due to B12 anemia, which the doctor felt indicated something wrong in my digestive tract since I should get enough B12 from my diet.  The shots help with the fatigue and I never located a digestive issue, even after several different tests.
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