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Insert the needle through the stopper and inject the air (this equalizes pressure and makes drawing easier)
These side effects were usually mild or moderate, often improved with time, and only a small number of participants stopped treatment because of them
Common side effects may include mild redness, swelling, or tenderness at the injection site, brief flushing, nausea, headache, dizziness, or fatigue
What the evidence does support is this: B12 deficiency causes fatigue and neurological symptoms, and correcting deficiency in people who are deficient improves those symptoms
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