C4 Smart Energy is the energy drink you can count on to fire up your brain power with laser focus and elevated energy for next level mental performance. Energy to Achieve From work to play, gaming to studying, C4 Smart Energy delivers the brain-boosting support of clinically studied ingredients to power you with: PLANT-BASED ENERGY: Harness 200mg of InnovaTea® caffeine — naturally derived from green tea for all-day energy and alertness. MENTAL FOCUS: Fuel focus and attention with brain-boosting nutrient Cognizin® Citicoline. INCREDIBLE FLAVOR: Smartly flavored with zero sugar, zero carbs, and zero calories. Brain Boosting Ingredients Unleash your inner Einstein and tap into the limitless power of your mind with the brain- boosting, clinically studied ingredients of C4 Smart Energy: InnovaTea®: Made from green tea, this naturally derived caffeine delivers all-day energy and alertness. Cognizin® Citicoline: This patented brain-boosting supplement helps support mental focus, attention, and recall. N-Acetyl L-Tyrosine: Helps the body produce key neurotransmitters like dopamine to support mood and cognitive health. Turbocharge your brain with the superbrain performance of C4 Smart Energy.