
Guarana extract is derived from the seeds of the South American guarana shrub (Paullinia cupana), most of which originates in Brazil. Traditional uses of guarana by natives of the Amazon Rainforest include mixing crushed seeds in foods and beverages to promote alertness, mental energy and focus. As a dietary supplement, guarana is an effective energy booster, as it contains about twice the caffeine found in coffee beans (about three to four percent caffeine in guarana seeds compared to one to two percent for coffee beans). Guarana may enhance mental performance. The seeds of guarana are known to be rich in xanthines (caffeine) and have been widely used as a tonic in many South American countries, particularly Brazil. In studies, which have determined the total xanthine content of guarana powder, caffeine content typically averages 30 to 50 percent (depending on the extract). Related compounds such as theobromine and theophylline are found at levels of (one to three percent) and, like caffeine, can be detected in the urine for up to nine days following guarana intake. Most of the scientific evidence on caffeine as a general stimulant and an aid to exercise performance shows convincingly that caffeine is effective.*
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