Ubiquinol pronounced You-Bee-Quin-Ol is the "active" antioxidant form of the popular supplement Co Enzyme Q10 (CoQ10). Technically there are two forms of CoQ10, ubiquinone (the oxidised form) and ubiquinol (the antioxidant form). More on this topic discussed below on the page.
Ubiquinol is naturally produced within our bodies and plays a critical role in energy production as an antioxidant. Ubiquinol is the body's primary endogenous (self produced, made within the body) lipid soluble antioxidant protecting cells, proteins and lipids.
Ubiquinol levels decline with age. From around age 30 and onwwards levels begin to fall, levels are estimated to sharply fall from age 50 onwards. Other ubiquinol depleting factors are oxidative stress and statin use.