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Guarana, also known as Brazilian cacao, is a rattan shrub of the saponaceae family, rich in the amazon river basin in northern Brazil. Guarana is the most famous rainforest medicinal plant in Brazil and has been recorded in the history records for a long time.
The native pronunciation of guarana is "maues-sateres", which means "mysterious eyes". From it’s appearance, we can see its fruit is like eyes clustered in trees. When we look guarana trees, we seem to see hundreds of eyes staring at us. So guarana is also compared into eyes.
The main extract of guarana extract is caffeine, which is used into many fields, such as beverage, foods, medicine and cosmetics, etc. Caffeine have effects of making airframe excited and alleviating fatigue and its effect is more moderate.
Caffeine is a xanthine alkaloid compound that acts as a central nervous stimulant, temporarily relieving sleep and restoring energy. Caffeinated coffee, tea, soft drinks and energy drinks are popular, so caffeine is also the most commonly used psychoactive drug in the world .In North America, 90% of adults use caffeine every day. Many natural sources of caffeine also contain a variety of other xanthine alkaloids, including cardiac stimulants theophylline and theobromine and other substances such as tannin.