* Dietary Supplement * Powerful Natural Antioxidant Source Naturals Green Coffee Extract is a powerful antioxidant that helps protect against oxidative stress caused by free radicals - a major cause of accelerated aging. Derived from raw, unroasted coffee beans, green coffee extract has been shown in research to support normal cellular regeneration and growth. Green coffee extract contains chlorogenic and caffeic acid, two primary compounds responsible for the activity of green coffee.