how long before b12 injection takes effect Does Vitamin Take to Work? Timeline & Signs How Fast Does a Vitamin

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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

If youre sensitive to shots, eat something light beforehand

Unlike GLP-1 receptor agonists, it does not primarily reduce appetite