I have been using this serum since it was launched and it really works for me. First, because it doesn't irritate my skin like other acne products. (trust me, I tried a lot, and all of them recommended by dermatologists. The last one I was using was Avene Triacneal, but I live in a very dry city - I don't know if it influenced - and my skin started to get red. Before I was using Epiduo - adapalene and benzoyl peroxide - and I had to stop because it was very irritating). Even the 2% salycilic acid in facial soaps was too aggressive for me. I needed something to treat acne that wasn't so harsh. This serum came right on time. It has only 1% salycilic acid, and at the same time has peptides to treat aging (peptides are little pieces of protein, and they help the skin to build collagen. Different then retinoids, for example, that stimulate the skin to renew the cells by exfoliating it). Of course I also use sunscreen on my face every day - its is the first rule if you want to prevent aging and dark spots. I still have cystic acne sometimes, but my I feel that my skin is healthyer than it was with other acne products. This serum is very gentle and hydrating enough without making your face oily. It has a fair price, one bottle costs $44.50 and lasts 1 month for me. It's my new favorite and I definitely recommend it.