C4 Original's high-powered formula features a special blend of patented ingredients that help promote energy and performance. We packed in 150mg of Caffeine for Hard Hitting Energy™ and CarnoSyn® Beta-Alanine for enhanced muscular endurance designed to keep you powering through even the toughest sets. With amino acids to boost protein synthesis and a variety of delicious sugar-free flavors, C4 Original keeps you hitting every rep as hard as the first.