Definition of vitamin B12 - NCI Dictionary of Cancer Terms

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vitamin B12 (VY-tuh-min ...)

A vitamin that is needed to make red blood cells and DNA (the genetic material in cells) and to keep nerve cells healthy. It is found in eggs, meat, poultry, shellfish, milk, and milk products. Vitamin B12, along with folate, may be given to help reduce side effects in cancer patients being treated with drugs called antimetabolites. Also called cobalamin.

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