Guarana Extract Paullinia cupana
It has been used to improve mental sharpness, reduce fatigue, increase stamina and endurance, and it may even lift depressed spirits. It is considered a favorite national diet drink in Brazil. Traditionally it was also used to assist in the relief of various ailments such as stress and nervous tension, weight control, headaches and hangovers, and even menstrual pain.
In addition to treating the conditions listed above, Guarana is useful for mild diarrhea, intestinal cleanser, urinary tract irritation, and headaches of a rheumatic nature. Some claim it has aphrodisiac effects, though there is no evidence to support this claim.