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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
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A deficiency can also cause issues such as diarrhea, nausea, vomiting, lack of appetite, weight loss, pale skin, numbness and tingling in your hands and feet, confusion, irritability, depression, and behavior changes
After 36 weeks of tirzepatide-driven weight loss, participants were randomized to continue tirzepatide or switch to placebo
