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NCI Dictionary of Cancer Terms

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niacinamide  listen  (NY-uh-SIH-nuh-MIDE)

  A nutrient in the vitamin B complex that the body needs in small amounts to function and stay healthy. Niacinamide helps some enzymes make energy in the cell. It is found in many plant and animal products. It is water-soluble (can dissolve in water) and must be taken in daily. It is being studied to increase the effect of radiation therapy on tumor cells. Also called nicotinamide.