C4 Energy Drink Ingredients Caffeine — 160mg of caffeine provides explosive energy and performance CarnoSyn® Beta-Alanine — clinically shown to delay the onset of fatigue resulting in improved muscular endurance and muscle capacity BetaPower® Betaine — Naturally-derived betaine from beets, helps maintain muscle cell hydration* L-Citrulline — Helps to increase nitric oxide for better blood flow N-Acetyl-L-Tyrosine — Used to support focus during stressful activities like physical training