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Draw air into the syringe: Draw back the plunger to fill the syringe with air up to the dose that youll be injecting
[1] [2] Blood levels of B12 may rise quickly following injection, though elevated blood levels do not immediately translate to symptom resolution
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The most common side effects of B12 injections are mild and temporary, including pain, redness, or swelling at the injection site, mild nausea or diarrhea, headache, dizziness, and itching near the injection area
