1999;277:E55160
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It is very important to note that each type has a different expiry date, so it is crucial for patients to take medication as per instructions given by their physicians or pharmacists
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
The liver stores B12, and these stores can last a significant time (up to several years for non-deficient individuals), but when they are depleted, it takes consistent input to rebuild and maintain them