The United States is not a member of the International Olive Oil Council, so American-made olive oil does not have to comply with the international standards. Most of our domestic olive oil is supplemented with corn and sunflower oil. The main measure for virginity, however, is still the acid level, so the flavor of extra-virgin Yankee olive oil should satisfy the average palate. But taste is not the main reason many people use olive oil. Most want to get away from oils which have saturated fats and use olive oil because it has monounsaturated fat.