Vitamin B12 Side Effects: Risks of Excess Intake 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: How Quickly Does B12 Shot Work? Does It Help to Lose Weight? Do You Need a Prescription for B12 Injections? OmegaQuant
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can b12 injections cause itchy skin How Long Does a B12 Shot Last?