Watermelon flavored zero calorie energy drink with other natural flavors. 0 calories per can. Zero calories. Zero sugar. Caffeine Content: 90 mg/16 fl oz. New. Alertness (See gamefuel.com for details). Accuracy (See gamefuel.com for details). GameFuel.com. We're here to help. GameFuel.com or 800.433.2652. Please recycle.