Guarana is a plant that's found in the Amazon basin in Brasil. While those who are native to the region use guarana seeds are medicine, the Western world adopted it in the form of an extract as a health & fitness supplement. It has a number of stimulants, such as caffeine, and it also boosts antioxidants. Its high caffeine content is one of the reasons why people hope to gain high benefits out of taking guarana supplements. But what does the research say? Find out now!