See all FAQs Important safety information and common side effects The most common side effect of B12 injections is irritation at the injection site
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This can lead to different kinds of anemia, fatigue, weakness, tingling in the fingers and toes, numbness, irregular heartbeat, mood swings, shortness of breath, very pale skin, memory loss, confusion, and more
intravenous TB-4 Phase 1 safety and pharmacokinetics, no dose-limiting or serious adverse events (Ann N Y Acad Sci 2010;1194:223229): NCT00743769 Medical Disclaimer The content in this calculator is for informational purposes only and does not constitute medical advice