The effectiveness of compound X is often dependent on the presence of compounds Y and Z and so on. Endogenous compounds like glutathione get much commercial attention but they do not work Glutathione is a powerful antioxidant made by the body that helps protect cells, support detoxification, and promote healthy, glowing skin. These foods naturally help boost and protect glutathione levels supporting skin health Programmed Cell Death as a Response to High Light, UV and Drought Stress in Plants IntechOpen Regulation of the Redox Environment IntechOpen