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Guarana beans
Paullinia cupana
Guarana beans (Paullinia cupana) is a climbing shrub native to Brazil and Uruguay. The Guarana beans contain caffeine.
Over centuries the many benefits of guaraná have been passed on to explorers and settlers. European researchers began studying guaraná (in France and Germany) in the 1940s, finding that Indians' uses to cure fevers, headaches, cramps, and as an energy tonic were well-founded.
Guarana is used and well known for its stimulant and thermogenic action. In the United States today, guaraná is reputed to increase mental alertness, fight fatigue, and increase stamina and physical endurance. Presently, guaraná is taken daily as a health tonic by millions of Brazilians, who believe it helps overcome heat fatigue, combats premature aging, detoxifies the blood, and is useful for intestinal gas, obesity, dyspepsia, fatigue, and arteriosclerosis.