C4 gen4 pre-workout the award winning pre-workout formula that helps you push your limits during intense workouts. the fourth generation c4 is the next level of innovation and refinement. its formula is now more dialed in, more potent, and includes the breakthrough ingredient, teacor for improved energy that comes on quickly and lasts longer. with creatine nitrate, beta alanine, l-tyrosine, arginine akg and caffeine as the key energy boosting ingredients, c4 extreme gives you the push to complete that last rep ultimately leading to improved strength and endurance.