I'm 47, and have excellent skin for my age. I've always used sunscreen and had a regular skin care regime, morning and night. But we all get older and over the last year or two, my skin got duller and I started noticing fine lines around my eyes and on my forehead. I'm too vain to go down without a fight (and am not willing to go the botox/surgery path), so I tried a few products. This product line (I'm using the moisturizer and eye cream, too) was the holy grail for me. I didn't have any skin irritation, and within a week, my skin had its pink and white glow back instead of that sallow, dull look. The fine lines around my eyes and forehead are all but gone. I'm so pleased. FYI, my skin is not particularly sensitive. The most I felt was a slight tingle the first couple times I used it, but I was able to use it twice a day from the very beginning. If you have sensitive skin, you might want to start out more slowly and let your skin acclimate.