Onsuri's selection of oils falls within the Ultra-Premium grade – the highest standard of quality in the world. Ultra-premium extra virgin olive oil accounts for less than 5% of all the worlds production, reserved for the finest extra virgin olive oils. Polyphenols are one type of numerous health-protective antioxidants that are found in extra virgin olive oil. Like other antioxidants, polyphenols fight oxidative stress and are proven to fight against aging-related diseases like heart disease, high blood pressure and cholesterol, and certain types of cancer.