Guarana - Energy - Fight Fatigue - Energy booster This makes it a wonderful energy booster. A natural stimulant, it prevents fatigue. It also prevents a dip in energy levels triggered due to muscle stress.AntioxidantsGuarana may delay in premature aging, given its ability to antioxidant, greater even than green tea and white tea which is rich in catechins. As this study shows, the catechins can reduce oxidative stress, which is usually related to the development of neurodegenerative diseases and cardiovascular, among other adverse conditions for health and well-being.