OK...i know absolutely nothing about skin care. My idea of skin care was ten rounds of cold water on my face. I tried pure radiance based upon reading Ben's book and within a few days I noticed a positive difference. However, the real testimony is that my very skilled Female partner, who has every skin care product you can imagine, stole my Pure Radiance and is now using it. I have had to re-order for myself. That is the real testimony because she knows what she is doing.