I've heard a lot of mixed reviews about retinol. Some people's skin loves it and others can't tolerate it at all. I decided to jump right in with the ordinary 5% and to my surprise...my skin would KILL for this stuff. I can't believe it works so well for my combination skin type. Doesn't cause me any break outs or irritation. My skin takes a minute to soak it up, but when it does....it does. My fine laugh lines have been fading as well as my under eye wrinkles. It takes its time, but it's proving worth it.