Guarana is a plant that is cultivated throughout northern parts of Brazil and Venezuela, countries that are often praised for their berries. The name of the plant comes from the Guarani tribe that lives in Brazil. The tribe believes that guarana has magical properties and that it is a cure for many bowel problems.
Both the tribe and the plant were discovered in the 18th century by a German botanist named C. F. Paullini. The key ingredient of guarana is guaranine, an element that is chemically identical to caffeine, which is the main reason for the energy boost after the consumption of guarana.