How Quickly Can I Expect to Feel Better After a B12 Injection? Vitamin B12 Injections: Good or Bad? 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: How Long Does a B12 Shot Last? LiveVibrant Wellness Guide
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do b12 injections make you feel sick Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods