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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

it truly depends on your unique health profile and goals

Best practice is to develop internal resources that define, per payer and medication, when a prior authorization is required

Hair Follicle Stimulation The Strongest Evidence The best-supported AHK-Cu benefit is the hair-follicle finding, and it's worth stating exactly what the study showed