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: Vitamin B12 Allergies Are Rare But Real. Here's Why. And the Food Babe Weighs In. American Council on Science and Health Do You Need a Prescription for B12 Injections? OmegaQuant What Are B12 Shots? 5 Benefits and Side Effects
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can b12 injections cause itchy skin How Long Does a B12 Shot Last?