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For larger vials, community protocols reconstitute only what will be used within 4 weeks
Improper handling or contaminated products may increase the risk of complications
Yes, B12 injections are generally considered very safe with minimal side effects
Image: Peter Dazeley/Getty Images About the Author Marygrace Taylor, Health Writer About the Reviewer Pieter Cohen, MD, Contributor Disclaimer: As a service to our readers, Harvard Health Publishing provides access to our library of archived content
However, excessive supplementation of vitamin B12 can also lead to serious consequences
Do the injections hurt
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