Free Radical Scavenger* Graviola tree (Annona muricata), also known as soursop, is found in tropical areas of the world. Its leaves have a long history of use by traditional herbalists. More recent scientific studies suggest that acetogenins, the active constituents of graviola, can support healthy cell growth and function.* Other active compounds found in graviola leaves have free radical scavenging properties.* Natural color variation may occur in this product.