Graviola 500 mg - 100 Veg CapsulesFree 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.