Dietary Supplement Powerful Natural Antioxidant Source Naturals Green Coffee Extract is a source of powerful antioxidant that helps protect against oxidative stress caused by free radicals - thought to be a factor in aging. Derived from raw, unroasted coffee beans and low in caffeine, green coffee extract has been shown in research to support normal cellular regeneration and growth. Chlorogenic and caffeic acid, two primary compounds responsible for the activity of green coffee, are present in Source Naturals Green Coffee Extract.