C4 Extreme Energy is a pre-workout made by Cellucor. As in the case of most pre-workouts, it is designed to boost energy, increase endurance, sharpen focus and enhance muscle pumps.
Beta-alanine (as CarnoSyn®) is said to reduce lactic-acid in the muscles, which could reduce fatigue. Beta-alanine is also said to work with citrulline malate to increase muscle pumps, while it could even enhance endurance when paired with creatine.
To help increase focus and energy, C4 Extreme Energy also features N-acetyl-L-tyrosine, caffeine, theacrine (as TeaCrine®) and huperzine A.
The pre-workout is – or has been – available in four flavors: “Strawberry Kiwi”, “Cherry Limeade”, “Icy Blue Razz” and “Lemon Drop”.