This study investigated the efficacy of coenzyme Q10 (CoQ10) in the treatment of chronic heart failure. Subjects with moderate to severe heart failure took either 300 mg of CoQ10 or a placebo daily for 2 years. Compared to the placebo group, the CoQ10 participants showed a significant reduction in deaths, primarily from cardiovascular disease, and a decrease in symptoms of heart disease. More details can be found in the study.
Mortensen, Rosenfeldt, Filipiak