Used as a general tonic for the body and as a source of energy. Guarana acts on the central nervous system to prevent fatigue and break down lactic acid from muscle stress. A high energy source that increases mental alertness, slows the pulse, decreases the appetite, fights fatigue, an excellent mood elevator. Also used as a nervine tonic for hangovers, neuralgia and menstrual headaches, leucorrhea, diarrhea, and fevers; it's chief use in Europe and North America is for headaches, especially if of a rheumatic or nervous nature