Hello Inés, thank you very much for your inquiry. It does not contain silicones but we cannot assure you that it does not contain sulfates, however, tell you that it is a very effective surfactant for hair and that all these ingredients are under the control of the European Union regulation and are completely safe. On the other hand, it does not wash off, it is a serum to apply a few drops after washing on wet or dry hair. You will notice from the first application a great change in the appearance and texture of your hair. All the best.