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
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Cardiovascular Effects: The peptide affects blood pressure through nitric oxide modulation
Drug, Lifestyle, And Nasal Factors Interactions and factors that can influence B12 therapy include: Medications Chloramphenicol may blunt the bone marrow response to B12