Guaraná is a plant native to the Amazon basin. The guaraná has large leaves and flowers, but it is best known for the seeds within the fruit. The seeds contain about twice the caffeine found in a coffee bean.
Guaraná is commonly used for weight loss, to improve athletic performance, and to reduce mental and physical fatigue. Another benefit that guaraná has is that it contains tannins, which help slowly release the caffeine, producing a long-lasting energy plateau, and prevent a crash/fatigue.
Natural Guaraná can be very bitter. It tastes best when its extracts are mixed and dissolved into high-energy beverages, where the flavor can be altered to a sweeter taste. Many companies who sell energy beverages are learning the many benefits guaraná carries.