CoQ10 is a vitamin-like substance that is naturally present in every cell of your body. It helps your cells produce energy for health and vitality. It is also a powerful antioxidant that protects cell membranes against damage caused by free radicals. CoQ10 helps support heart function. Your body produces CoQ10 naturally, though your body's ability to convert it to an active form diminishes with age. While CoQ10 can be found in many foods, it exists there only in small concentrations. That is why a CoQ10 supplement, like Qunol Ultra CoQ10, is beneficial. It helps your body maintain optimum levels of this important nutrient.