A slightly bitter, stimulant, tonic herb that lowers fever and has astringent and diuretic effects. Used in Brazil extensively as a tea and in cool drinks, Guarana also is noted as an aphrodisiac. It is best known for its ability to relieve fatigue, aid concentration and lift the spirits. Also recommended for weight loss and as an energizer; headaches and migraines. Contraindicated in cardiovascular disease and hypertension.