Doctor's Best Ubiquinol with Kaneka Ubiquinol contains the reduced form of coenzyme Q10. Both ubiquinol (CoQ10-H2) and ubiquinone (CoQ10) are metabolically active. Each form has 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. It may offer improved bioavailability in aging adults who may have difficulty achieving high levels of this nutrient, or those concerned with nutrient absorption.