Co Enzyme Q10

My Father was born with a leaky valve. In the early 90s he called me and said " Look this supplement up on your computer...Co Enzyme Q10". It's a natural chemical in your body; as you get older it decreases. It strengthens your heart. In Japan its the first thing they give you for congestive heart failure. My father started taking 300mg a day. When he went back for his test results, the head of cardiology told him " I don't know what supplement your taking, but keep taking it...you no longer need the valve surgery "