C4 Smart Energy is a naturally caffeinated energy drink containing 200mg of caffeine from tea leaves, along with Cognizin citicoline and green tea extract to support energy, focus, and mental alertness. This zero sugar, zero calorie beverage is formulated with no artificial colors or dyes, making it suitable for anytime energy needs from work and study to gaming and pre-workout activities. The carbonated drink comes in multiple fruit-inspired flavors in ready-to-drink 12 fl oz cans.