Guarana has been cultivated by South American Indians since pre-Columbian times. Guarana contains guaranine, which is chemically very similar to caffeine. Guaranine is released slowly, over as much as 6 hours time, so the energy boost that is experienced from Guarana is not like that of coffee with its sudden rush and quick drop-off. Rather, it continues to escalate over hours. Whereas caffeine provides a short- lived energy burst that overheats and excites the body, guaranine has a cooling action that revitalizes and relaxes. This is because Guarana contains other components that modify the activity of the guaranine. 

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Highly concentrated guarana seed extract.