b12 injection storage temperature Cyanocobalamin Injection USP 1000 mcg/mL 5 b12 injections Compounded Hydroxocobalamin

Side Effects of B12 Injections While B12 injections are generally safe, they may cause side effects in some individuals

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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

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