Vitamin B12 Allergies Are Rare But Real. Here's Why. And the Food Babe Weighs In. American Council on Science and Health Vitamin B12 Side Effects: Risks of Excess Intake MIC B12 Injections Before & After: Results in 1 Week vs 1 Month 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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