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Some free radicals are the result of naturally occurring processes.
As our bodies use oxygen to generate energy, free radicals are created as metabolic by-products. In addition, our levels of free radicals are increased by a number of different factors. These include cigarette smoke, excessive alcohol consumption, air pollutants, as well as ultraviolet and other radiation. Free Radicals react with the molecules of our cells, in a reaction known as oxidation. This damages the cells, preventing them from functioning normally.