side effects to b12 injections Injection Safety, & Risks Side Effects of Vitamin B12

Long-term storage at -20C is recommended to maintain maximum purity

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The effects of a single B12 injection typically last one to two weeks, though this varies depending on your baseline levels, metabolism, and overall health

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Vitamin B12 shot side effects Most people tolerate vitamin B12 injections well, but possible side effects include: Mild: soreness or redness at injection site, mild diarrhea, nausea, headache, itching Rare but serious: allergic reactions (rash, swelling, difficulty breathing), low potassium (hypokalemia), dizziness or heart rate changes Get emergency medical help if you have signs of an allergic reaction to Vitamin B12: hives