Doctor's Best Ubiquinol with Kaneka Ubiquinol contains the reduced form of coenzyme Q10. Both ubiquinol (CoQ10-H2) and ubiquinone (CoQ10) are metabolically active, and each form plays unique roles in cells relating to antioxidant actions, supporting healthy heart function and enhancing energy production.* Ubiquinol helps regenerate other antioxidants such as vitamin C and E and may offer improved bioavailability in aging adults who may have difficulty achieving high levels of this nutrient, or those concerned with nutrient absorption.* Doctor's Best Ubiquinol with Kaneka Ubiquinol provides defense against oxidative damage to the body's cells, including lipids, proteins and DNA.* It also plays an essential role in cellular ATP (energy) production.