C4 Ultimate

Buyers rate the flavor highly at 4.2/5. They describe it as smooth with a clean taste—for example, the orange cream variety delivers instant orange flavor with a light cream aftertaste, and owners say it lives up to Cellucor's reputation for orange flavors.

C4 Ultimate contains high caffeine that delivers strong energy for most users. Buyers rate the caffeine level and intensity at 3.1/5, meaning opinion splits—some appreciate the kick while others find it too intense and would prefer a gentler stimulant level.

Cellucor removed beta-alanine from the Ultimate formula, which was present in the original. Buyers rate the absence of beta-alanine at 2/5, and some report that the original formula hits harder despite its lower caffeine dose, making the Ultimate feel like a standard energy drink by comparison.

Anyone sensitive to stimulants should start cautiously, since C4 Ultimate has high caffeine content. The press notes this is a key dividing point among users.

Buyers rate energy and performance at 4.4/5, the highest rating across categories. Most users find it effective for the energy boost they seek.

Buyers rate overall value versus the original C4 at 3.2/5, showing mixed sentiment. The removal of beta-alanine and the shift in formula make this a different product at a similar price point, so whether it's worth it depends on what you're looking for.