**GUARANA: Benefits, Side Effects, Uses, Dosage, Warnings?** Guarana is to make people perk up tired. The Liane, one of the soap tree and plants native to the area of the Amazon, has five times the amount of caffeine compared to coffee bean. Therefore, the guarana plant is often referred to as a caffeine- ... drinks (energy drinks, etc.) syrup, yogurt, shower gel or shampoo. Pharmaceutical companies are now "come guarana" on - Guarana effervescent tablets are the newest hit.