Guarana is primarily used to boost energy. It has two times more caffeine than coffee beans, with its content rate at 2-5%. Guarana can be found in many commercialised products including soft drinks, energy shots and capsules. It can also be found in herbal tea.There are many effects when you consume Guarana, most of them positive. The biggest positive effect comes cognitively. It has been shown several times - through clinical studies - that Guarana can improve memory and alertness. In many cases it can also improve a person's mood.