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GuaranaGuarana comes from the seeds of a South American shrub – most of which originates in Brazil. As a dietary supplement, it’s no wonder that guarana is an effective energy booster – as it contains about twice the caffeine found in coffee beans (about 3-4% caffeine in guarana seeds compared to 1-2% for coffee beans). Concentrated guarana extracts, however, can contain caffeine at levels of as much as 40-50%, with popular supplements delivering 50-200mg of caffeine per day (about the same amount found in 1-2 cups of strong coffee). As with any caffeine-containing substance, too much can lead to nervousness, tension and headaches.Claims are that it Increases energy levels, reduces fatigue, enhances physical and mental performance, promotes weight loss, suppresses appetite While caffeine in general is an appetite suppressant, its effect in increasing metabolic rate is negligible when taken on its own. In combination with ephedra and aspririn (or the plant variants Ma Huang and white Willow Bark (ACE pack) it can achieve and 8% increase in metabolic rate - the euqivalent of a 20 minute walk. In high doses onsumed about 1 hr before exercise it increases endurance and performance in athletics. |
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Copyright 2004 Dr Angie Hayes |  |