The Kiehl's chemists have found a way to get a stabilized, high level of pure vitamin C (10.5 percent) -the ingredient that helps beat crows feet, marionette lines, and under-eye wrinkles- in this super-charged serum. Two weeks ago I found it and started using it and my skin is so smooth, so even, it's truly a great product. I have THE MOST sensitive skin who is prone to Dermajeun Cream on my face and this has not irritated my skin at all. I sometimes use retain a and its just too harsh for me this product does the same that my retina does except doesn't leave my flakey or dry.For more information, please visit : http://antiagingskincares.org/dermajeun-cream/