Cell Cycle CatalystSkinCeuticals Cell Cycle Catalyst is a clinically proven, daily use exfoliating serum designed to boost the results of any anti aging routine. Powered by a 7. 7% multi acid complex (alpha hydroxy and beta hydroxy acids) and 1% taurine, this layerable serum gently accelerates cellular turnover at the skins surface. The result: smoother texture, improved discoloration, visibly reduced fine lines, and optimally maintained hydration for a healthy,