Mangosteen is a fruit. Some people like a previous queen of England say that it is the best tasting fruit. It grows in the tropics but does not do well in transportation so that is why I have never seen one. Fruits are the healthiest foods like pomegranite, goji berries and others. Mangosteen has many health benefits. A guy from Singapore owns a restaurant in America. As a kid, he would climb up a tree and pick a mangosteen and eat it.