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Which form (and whether either is right for you) is decided with your provider based on your goals and health history not something to guess at from a forum

[6] There are 4 common injection sites for administering B12, but you'll want to discuss what's best for you with your doctor

Researchers must carefully consider these pharmacokinetic challenges

So, B12 injections can last for one month with slow release into the blood. In contrast, an IV (intravenous) infusion gives you the dose immediately so that you get the benefits immediately, and the effects are shorter lived
