10 Skin Signs You're Low on B12 (Most People Miss These!) YouTube 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: B12 Injection Side Effects Consensus Academic Search Engine Do You Need a Prescription for B12 Injections? OmegaQuant
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