Originating from Indonesia, this tropical fruit is rarely consumed in the United States. In terms of how much antioxidants mangosteens have, it's in the low to mid range versus fruits overall. This is not surprising since many tropical fruits rank relatively low. There are a couple health benefits though, such as being rich in fiber (13% of your RDA per cup) and vitamin C.
What do mangosteens taste like? Many describe the flavor as something between a nectarine, strawberry, and pineapple.
USDA Database for the Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 - Prepared by Nutrient Data Laboratory, Beltsville Human Nutrition Research Center (BHNRC), Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA) - May 2010