Thinning and weakened hair often makes you feel stuck in a vicious cycle. How to break free? By ensuring a treatment tailored to their needs, right from the washing stage. Enriched with magnesium, L'Oréal Professionnel Serie Expert Serioxyl gently cleanses the hair while helping to remove unwanted buildup from the roots that can hinder healthy growth. After washing, it immediately adds volume to the hair fibers and enhances shine. Enjoy the feeling of hair that is thickened once again.