Guava Flavored Energy Drink With Added Taurine, Caffeine, Guarana, Ginseng and Vitamins. Caffeine helps improve alertness. A wide range of the best flavored big can energy drinks, with double the size and double the kick. Great taste products that immediately energise and hydrate Born in Las Vegas Rock star is the original big can energy drink, and it is that West Coast American spirit that delivers a fun, positive and very cool energy drink.