Retinol 0.5 contains .5% pure retinol and is enhanced with the latest stabilization and delivery technologies to provide maximum efficacy. Retinol 0.5 is recommended for more sensitive skin or to help condition skin not acclimated to retinoids as a prerequisite to SkinCeuticals Retinol 1.0. Our retinol products help stimulate cell regeneration and build collagen to diminish the appearance of fine lines, wrinkles, and age spots from both photo- and intrinsic- aging. Additionally, they help minimize the appearance of pore size, while correcting blemishes and blotchiness often associated with problematic skin