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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

The problem arises when compounders use bulk drug substances, raw active ingredients, that lack sufficient FDA evaluation or safety data

Patients interested in fat loss, insulin resistance, or metabolic health should start with a medical review

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