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Energy drinks are beverages that are designed to give the consumer a burst of energy by using a combination of methylxanthines (including caffeine), B vitamins, and exotic herbal ingredients. Energy drinks commonly include caffeine, guarana (extracts from the guarana plant), taurine, various forms of ginseng, maltodextrin, inositol, carnitine, creatine, glucuronolactone and ginkgo biloba. Some contain high levels of sugar, while most brands also offer an artificially sweetened version. The central active ingredient in energy drinks is caffeine, the same stimulant found in coffee or tea, often in the form of guarana or yerba mate. The average 8oz energy drink has about 80mg of caffeine, about the same amount as a weak cup of coffee, with 16oz drinks containing around 150mg, although recent drinks have created a stir by containing as much as 300mg of caffeine.