b12 injected into blood vessel Treating Severe Vitamin Deficiency Best Vitamin B12 Injection Site:

Learn where to self-administer a B12 shot and how to do it painlessly This article was medically reviewed by Shari Forschen, NP, MA and by wikiHow staff writer, Amber Crain

Risks and Side Effects Potential Side Effects While vitamin B12 injections are generally considered safe, they can cause side effects in some individuals

We regularly check lab results and how patients are doing to see if the dose is right

Adults can completely fail to absorb the vitamin administered orally

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