Explosive energy, heightened focus and an overwhelming urge to tackle any challenge...that’s the C4 experience. Millions of people—ranging from beginners all the way up to the elite competitors, have relied on C4 to help them turn their ambitions into achievements. As America’s #1 selling pre-workout, C4 Original lives up to its solid reputation with a classic formula for advanced energy, endurance, focus and pumps! But with a new bottle design and more delicious flavor options for you to choose from, you’ll feel like it’s your very first time experiencing the C4 you know and love. Whether you’re just starting a fitness journey or you’re striving to reach that next level, C4 Original will help you unlock your full potential. Contains CarnoSyn Beta Alanine, an amino acid, which converts to a compound in your body called carnosine. It is the only patented and clinically studied form of beta-alanine that has been shown to support muscular endurance.