b12 im injection sites shot site or subq B12 Injections for Energy: Benefits and How It Works Where to Inject Vitamin B12 – Common Mistakes in B12 Injections

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Most patients do well with B12 injections, but its good to know about possible side effects, says a top expert in vitamin B12 therapy

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It's best to follow their directions and use this article as a refresher

Common side effects include, but may not be limited to: pain or redness at the injection site mild diarrhea pruritus (itching) increased swelling joint pain dizziness headache nervousness or anxiety Serious side effects may include: allergic reactions peripheral vascular thrombosis hypokalemia (low potassium levels) pulmonary edema (fluid build-up around or in the lungs) thrombocytosis congestive heart failure There have been reports of anaphylactic shock and death after the parenteral administration of vitamin B12