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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

Use a sterile, new needle with each injection

A blood test through your GP is the first step, not a private clinic

Niagen: A precursor to NAD+ that supports cellular repair, longevity, and metabolic health