Catuaba is a natural remedy derived from the bark of trees of the Brazilian rainforest. Formulations vary depending on the type of tree selected but are nevertheless said to stimulate the nervous system and offer aphrodisiac properties. Among the trees used for catuaba (a tribal word meaning "what gives strength to the Indian") are Erythroxylum caatingae, Trichilia catigua, Anemopaegma arvense, and Micropholis caudata.