I waited a while to write this review, but after about 2 weeks of alternating this and the Cosrx AHA, I am already seeing great results. My skin is more even and smooth, the little pimples on my cheeks went away. It even seems like my freckles faded. It didn't make my skin tingle like some people's, but my boyfriend has sensitive skin and it irritated his face, so if you have sensitive skin, use this sparingly. This is a product that really works!