C4 Sport The top pre-workout formula for beginners and elite athletes. Ignite your fitness journey with this top-notch pre-workout formula from C4. Ideal for beginners and professional athletes alike, each serving contains a unique blend of caffeine, creatine, vitamins B6 and B12, and magnesium. Benefits: Vitamins B6 and B12 help support energy metabolism. Caffeine helps increase alertness and improve concentration. Creatine increases physical performance in successive bursts of short-term high-intensity exercise. Magnesium contributes to electrolyte balance.