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Monitoring and adjusting your dose Optimal dosing often requires adjustment based on individual response
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
Drug approval takes years, moving through phased clinical trials that grow from just a few hundred participants to thousands
No human RCT has confirmed an optimal oral dose
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