From the Manufacturer:
CoQ10 has found extensive use in supporting a healthy heart. For many years doctors in Canada, Japan, Russia and some European countries have used CoQ10 to treat congestive heart failure (CHF). In a majority of patients with CHF, CoQ10 lessened the swelling in legs caused by pooling blood. Fluid retention in the lungs also improved which led to better breathing and enhanced exercise capacity. CoQ10 may also impact heart attacks by inhibiting blood clot formation. Heart attack sufferers reduced their risk of a second heart attack by taking CoQ10 in the first three days following their initial heart attack. They were also less likely to experience chest pains or die from heart disease.