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When Controlled Supplementation May Be Necessary In some cases, taking extra folic acid and vitamin B12 might be needed during cancer treatment

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

How Vitamin B12 Functions in the Body Vitamin B12 helps make DNA, fatty acids, and energy

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