A legacy of excellence - we've been pioneering, building, and perfecting pre-workouts longer than most brands have been in sports nutrition. We're Obsessed with research, improvement, and results. We're innovators and leaders, and we're not new to our work. We have a legacy of building the best, most effective pre-workouts available. Great taste, zero sugar, Zero calories, zero carbs: C4 Original carbonated packs 200mg caffeine to maximize energy and improve performance wherever your workout takes you. 100% Satisfaction guarantee: All Cellucor products are thoroughly developed, accurately tested, and proudly manufactured in the United States. All Cellucor sales by Amazon are backed by a 30-day, full money-back guarantee. Clinically studied, patented ingredients - C4 Original carbonated contains an explosive energy Blend, including CarnoSyn Beta Alanine and Citrulline Malate, to create a clean, refreshing energy drink. Superior flavors - many choices. Find yours. Cellucor offers best-in-class flavors to fuel optimal performance.