Unleash your inner Einstein and tap into the limitless power of your mind.

Powered by InnovaTea® Naturally Derived Caffeine (from Tea), brain-boosting Cognizin®, and the additional support of N-Acetyl L-Tyrosine, C4 Smart Energy delivers energy, focus, and mental performance to help you conquer any task—from work to play, gaming to studying, partying to planning. C4 Smart Energy is proudly made with natural flavors, no artificial colors or dyes, and contains zero calories, sugar, or carbs.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

^The NSF Certified for Sport® certification applies to C4 Energy product produced during and after June 2021.

• NATURALLY SWEETENED — Naturally sweetened and proudly made without artificial colors or dyes.
• PLANT BASED ENERGY — Elevate your energy and overachieve. Smart Energy Natural Zero contains 150mg of InnovaTea caffeine which is naturally derived from green tea.
• MENTAL FOCUS — Cognizin is a patented citicoline, which is a nutrient that helps support mental focus, attention and recall.
• INCREDIBLE FLAVOR — Incredible naturally sweetened C4 taste with zero sugar.