special subjects
Coenzyme Q10
What is coenzyme Q10?
Coenzyme Q10 (ubiquinone) is an enzyme that is naturally produced in the body. Cells use it to produce and manage energy. It also has an antioxidant effect. Antioxidants protect cells against damage by free radicals, which are highly chemically active by-products of normal cell activity. The levels of coenzyme Q10 seem to be lower in older people and in people with chronic diseases, such as heart problems, cancer, Parkinson disease, diabetes, HIV infection or AIDS, and muscular dystrophies. However, it is not known whether these low levels contribute to these disorders. In addition to being naturally made in the body, coenzyme Q10 is in foods such as meat, fish, and vegetable oils. A synthetic form of coenzyme Q10 is available as a dietary supplement. (See also Overview of Dietary Supplements .) 