B12 to Lose Weight: Taking Vitamin Injections for Weight loss How Long Does Vitamin B12 Take to Work? Timeline & Signs Performance Lab Can a B12 Deficiency Make You Feel Like You Are Dying? 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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