Coenzyme CoQ10 (or CoQ10 for short) is a naturally occurring nutrient-like coenzyme that plays an important role in the production of 95% of the energy used by our organs, and no other organ needs more energy than our hearts. Unfortunately, our CoQ10 levels may drop due to age, stress, and cholesterol-lowering statin drug therapy. Taking a CoQ10 supplement may help increase your CoQ10 levels.