Vitamin B 12: What Is The Best Way To Take ConsumerLab.com What Are B12 Shots? 5 Benefits and Side Effects How Quickly Do Vitamin B12 Injections Work? Prime Aesthetics 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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