Obagi C is similar to Nuderm in its ability to increase cell turner however this line is focused on also protecting the skins exposure to free radicals with added antioxidants to reduce the speed of skin aging this is a graduated step up from the Nuderm system when the skin needs a change of product and the skins pigmentation has been corrected and now is just in need of protecting the natural progression of the pigmentation returning from natural photo aging and environmental free radicals.