CoQ10

CoQ10
Coenzyme Q is a greatly underappreciated substance that is both made by our bodies and obtained in the diet, mainly in oily fish.  CoQ is a mainstay of the energy production process in the body’s cells.  Our cells have trouble generating energy without CoQ, particularly when those cells are in organs that are highly active in terms of energy and oxygen processing.
The list of heart problems that have been helped by CoQ supplementation include angina, arrhythmias, cardiomyopathy, congestive heart failure, and mitral valve prolapse.  There is research on the use of CoQ with other chronic health problems, including cancer, diabetes, obesity, AIDS, muscular dystrophy, and infertility.   Doses for CoQ range widely, from about 30 to 100 mg per day.
Source: Haas, E. (2006) Staying Healthy with Nutrition: The Complete Guide to Diet &      Nutritional Medicine. New York, Ten Speed.