Co Enzme Q10 is a compound which plays a vital role in the production of energy. When you have a Coenzyme Q10 deficiency, it will interfere with this process and can leave you feeling tired and lifeless.
Coenzyme Q10 has many other uses and you might want to read up on it yourself. The vitamin company Solgar has a form of Coenzyme Q10 called Nutri-Nano Coenzyme Q10, which I especially like. Why is that? Well, strength, purity and absorbtion. Per tablet it's about three and a half times more potent than other brands of Coenzyme Q10. It's more cost effective since you only need one 30mg tablet a day as opposed to three 30mg tablets of other makes. And since quite a bit of the active ingredient is lost in transit through the stomach you should be taking around 100mg anyway. Nutri nano is a 'nano' form of Coenzyme Q10. That doesn't mean genetically modified, only that the particles are very fine, much smaller than other types. The advantage of that is that there is more absorbtion, allowing a greater amount of 'packagages' of the Coenzyme Q10 to reach the right sport without the traditional loss in transit.
In any event, consult your doctor if on any medicine and particularly if you are on heart medication.