how long does b12 injection side effects last Vitamin Why Do I Feel Worse
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It started after injection number 4 and when I mentioned it to the nurse administering the injections she was dismissive and didnt appear to know (or believe) it was a possible side-effect
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doi: 10.1016/j.celrep.2016.07.027

If you have a vitamin B12 deficiency, that can cause fatigue
