Discussion: Mangosteen is a tropical evergreen tree native to Indonesia. Mangosteen fruit is often referred to as the ""queen of fruits"" due to its pleasant flavor. Mangosteen fruit contains polyphenols known as xanthones. Research indicates that the xanthones have powerful antioxidant properties. Each VegCap of Solaray Mangosteen peel extract is guaranteed to provide 75 mg Xanthones, 100 mg Polyphenols and 1,750 Orac units (Oxygen Radical Absorbance Capacity).