Help your heart out with Qunol Ultra CoQ10 M Mg Softgels Dietary Supplement - 30 Ct. CoQ10 (Coenzyme Q10) is a naturally occurring nutrient that works in the body's electron transport system. CoQ10 regulates the flow of oxygen moving in and out of the mitochondria, which are the cells' power plants. This dietary supplement could help to boost energy levels, strengthen and protect the heart and blood vessels, enhance the immune system and protect against free radical damage. Like all muscles, the heart needs adequate energy to contract, and CoQ10 facilitates the production of that energy. In those with coronary heart disease, supplementation may reduce the frequency of angina episodes and increases the amount of physical exercise that a person can perform before developing angina pain. Tissues that need the largest amounts of CoQ10, like the heart, are those that require the most energy.