Recent data has documented once again that coenzyme Q10 improves hypertension and can prevent congestive heart failure. It can improve cardiac output by as much as 39% and significantly increases exercise capacity of patients with all levels of congestive heart failure. It has many other functions such as increasing HDL cholesterol, immunity, and arterial elasticity and has powerful effects on cancer cells. Coenzyme Q10 is essential in the production of ATP and is a potent antioxidant. The role of statins in blocking the production of coenzyme Q10 is also discussed.