What Are B12 Shots? 5 Benefits and Side Effects Vitamin B12 Injection Side Effects and Safety B12 Shots in Friso, Sherman, Anna. and Sunnyvale, TX High dose vitamin B12 supplements can sometimes cause side effects, including headache, nausea, vomiting, mild diarrhea, itching, skin rash, tiredness, weakness, or tingling in the hands and feet. OC:
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headaches after b12 injections Only One Chance - B12 Deficiency