C4 Sport Pre-Workout energy optimized for exercise. It combines two formulations to support performance and energy into one, so every base of your workout is covered. The performance side includes creatine monohydrate for muscle endurance, Arginine AKG to increase blood flow and keep you going, and Beta Alanine to help keep fatigue at bay. The energy side contains an explosive blend of caffeine and taurine for unrivaled focus and energy.C4 Sport carries the Informed Choice logo. This means that the product has gone through a full manufacturing audit, and is regularly tested for a wide variety of WADA banned substances to ensure safety for sport.