PREVAGE Anti-Aging Daily Serum protects and corrects the look of skin, helping shield it from environmental assaults and intercepting future aging signs to dramatically improve the look of sun-damaged skin. Idebenone has been tested under the rigorous EPF Environmental Protection Factor protocol. EPF assesses how much protection you'll get against environmental aggressors such a stress, pollution, and smoke- all of which accelerate the signs of aging. When tested, Idebenone scores an EPF ating of 95 out of 100. In fact, testing has shown that Idebenone outperforms the leading antioxidants alpha lipoic acid, kinetin, vitamin C, vitamin E, and coenzyme Q10 in preventing oxidative stress.