I use it weekly and it definitely makes a difference. Be careful not to leave the acid on too long though. It's very strong and you will see amazing results, but you can get a chemical burn if left on too long. The replenishing paste puts my skin at ease and although I had a pretty effective routine already, this duo took my skin another step further. It is expensive though which is why I took one star off. I feel there are other products on the market that deliver great results at a lower price point. It's not a necessity, but a nice luxurious treat for sure.