Guaranà (Paullinia cupana Kunth) is a plant originating from South America. It increases mental alertness and combats fatigue and it is a very high source of energy. Guaranà is a source of naturally occurring caffeine besides other related alcaloids. Although it contains a higher percentage of caffeine than coffee, the other contained compounds cause its stimulating effects to be more gentle than coffee and other sources of caffeine.

Image credits: A C Moraes from Brasília, Brasil [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)]