Soursop is the fruit of Annona muricata, a broadleaf, flowering, evergreen tree. The exact origin is unknown; it is native to the tropical regions of the Americas and the Caribbean and is widely propagated. It is in the same genus, Annona, as cherimoya and is in the Annonaceae family.
Raw soursop is 81% water, 17% carbohydrates, 1% protein, and has negligible fat (table). In a 100-gram reference amount, the raw fruit supplies 66 calories, and contains only vitamin C as a significant amount (25%) of the Daily Value, with no other micronutrients in appreciable amounts.