Green coffee beans are unroasted seeds of the plant Coffea Arabica. Green coffee beans are loaded with antioxidants and active compounds most important of which are Caffeine and Chlorogenic Acid. Chlorogenic Acid is believed to be the main active ingredient in green coffee beans. That is, the substances that promotes natural weight loss. Green coffee beans are the same as regular coffee beans, except that they haven’t been roasted yet. They are high in a substance called Chlorogenic Acid.