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"Free Radical"

By Shereen Jegtvig, About.com

Updated: November 7, 2007

About.com Health's Disease and Condition content is reviewed by our Medical Review Board

Definition: As the body uses oxygen, these by-products cause oxidative damage to the cells of the body. Free radicals come from smoking, pollution, poisons, fried foods, and as a by-product of normal metabolism. Free radical damage is associated with an increased risk of many chronic diseases. "Antioxidants" such as vitamin C, carotenes and vitamin E reduce the damage caused by free radicals.

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