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Take the lid off the B12 solution and swipe the rubber top with alcohol
Insert the needle into the ampoule or vial: For vials, inject air equal to the dose to ease withdrawal
Seek medical advice if symptoms persist or worsen
Ensure muscle is relaxed before injection
[10] This draws air into the syringe which prevents a vacuum from forming when you push the plunger in the next step
Syringe and two needles : One (often purple/red) for drawing up the dose
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