In the research I have done over the past 5 years, the studies I've read on CoQ10 have been most impressive.

Low blood and tissue levels of CoQ10 have been found in numerous heart diseases, including angina pectoris, aortic valvular disease, cardiomyopathy, congestive heart failure, coronary artery disease, hypertension (high blood pressure), mitral valve prolapse, and even in individuals who have had coronary artery bypass surgery. There is also a strong correlation between the severity of heart failure and low blood and tissue levels of CoQ10. Fortunately, heart tissue levels of CoQ10 can be significantly restored through oral supplementation...the heart muscle is the most responsive of body tissues to CoQ10 therapy.
(Source: HART Master Reference, Copyright 1997-2003)

Not surprisingly, I have both my father and grandmother taking NSP's CoQ10-100! <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />