I bought this serum after I read reviews on Wilma Scumann web site. My expectations were not very high taking into consideration that I spend a lot of money on expensive products that were recommended for acne prone skin. Now after several days of not using Retin A and using this serum instead, I can say that it is very good and my skin is hydrated and I have no more break outs. I recommend it and it must be used on damp skin. Better if damppened with a thermal water spray, like Avene.