Graviola (Annona muricata) is a small evergreen tree, 5 to 6m high, with large, dark green, glossy leaves that is native to the Amazon rainforest and other tropical areas of the Americas. It produces a large, heart shaped edible fruit that is 15 to 23 cm in diameter, is yellow-green in colour, and has white flesh inside. In Brazil, the juice is a popular drink, and is known as Guanábana. Many actives have been found in all parts of the plant - including the leaf, bark, root, stem, and seed. Graviola is becoming increasing well known as a source of antioxidants called annonaceous acetogenins, that are found mainly in the leaf and seeds. Rio Amazon Graviola powder is derived from the Graviola leaf - which contains many of the annonaceous acetogenins.