Soursop, also known as graviola, is the fruit of Annona muricata, a type of tree native to tropical regions of the Americas. This prickly green fruit has a creamy texture and a strong flavor that is often compared to pineapple or strawberry. A typical serving of this fruit is low in calories yet high in several nutrients like fiber and vitamin C. Soursop also contains a small amount of niacin, riboflavin, folate and iron. Interestingly, many parts of the fruit are used medicinally, including the leaves, fruit and stems. It is also used in cooking and can even be applied to the skin.