For over a decade the C4 family has been leading the category and Ultimate is our strongest pre-workout yet. C4 Ultimate is a high stimulant pre-workout formulated to deliver lasting energy, pumps, and muscular endurance. Our dual-source caffeine technology supports increased power and power output to help you take your results to the next level. C4 Ultimate delivers energy you can feel, powerful pumps, muscular endurance, extreme focus, and peak performance. All it takes is one scoop and you can feel the difference.