I was really surprised at what a difference I saw in my skin after using this product. I'm 24 and have adult female acne (luckily it's gone now since I cut out dairy and sugar from my diet and started using Paula's Choice salicylic acid, glycolic, and a non-Paula retinol product). The Paula BHA product is great for dealing with existing breakouts, but this glycolic acid has made most of my post-acne marks disappear, and I've only been using it for about three weeks. When I use it at night, I wake up and my skin is smooth and glowing. My skin went through a slight purge the first week I started using it; I feel like it just pulled all the gunk out of my skin. Even my blackheads on my nose are gone! I will definitely buy this product for as long as it's available.