Catuaba bark is one of several herbs that contains many beneficial compounds that can be helpful to a number of health conditions. Catuaba bark refers to the bark of the Catuaba tree, which grows in the rainforests of Brazil. In addition to treating impotence, it is employed for many types of nervous conditions including insomnia, hypochondria, and pain related to the central nervous system (such as sciatica and neuralgia). It is sometimes considered one of the effective herbs to help sleep, but its suspected healing abilities go far beyond sleep and libido.