I note that I have long, blond hair with highlights, slightly oily at the roots, and I bought it after the summer when my hair had been greatly damaged by the sun. I used the shampoo for a month along with the mask from the same range (therapiste) without interrupting my treatment with any other product in order to have an informed opinion. The good thing is that it lasts almost a month with almost daily use, even though it is only 250ml because it has a concentrated formula, the hair is very soft after use, and it has a pleasant scent. The bad thing (and the reason why I will say that it was a WASTE OF MONEY and DO NOT BUY IT) is that it contains SLS, to be precise it contains 6!!!!!!! different sulfates, while it is intended for damaged and destroyed hair. SLS, for those who do not know, dehydrate and destroy the hair, so now that I am using it, it may give a nice result, but long-term it is not recommended as a treatment for the hair. I'm sorry, but from such an expensive product, I naturally expect it to provide real reconstruction. I trusted the name of Kerastase and did not read anything about the formula, that was my mistake and that's why I'm writing here. I am really very disappointed and I can't understand how Kerastase, which is considered the top company for hair products, has included SLS in the repair range. I am very disappointed and I can't wait to try other products, but this time I will be more informed