Ultimate pre-workout performance for men & women Formulated to fuel your ultimate, C4 Ultimate contains ingredient dosages for unmatched energy, powerful performance, muscular endurance, and extreme focus. Fuel your ultimate training and results with 300mg of caffeine for no-holds barred energy. Elevate nitric oxide levels with a 6g Super Pump matrix of L-Citrulline, Citrulline-Malate, and (NO3-C) Citrulline Nitrate. Legendary zero sugar C4 Strawberry Watermelon taste in every scoop. With billions of servings sold, Cellucor C4 has been setting the standard in flavor for over a decade.