L’Oréal Professionnel Serie Expert Serioxyl Denser Hair Serum will deliver denser hair in just 6 weeks with daily application. Born from 10 years of research, the Serioxyl line offers professional care routines for hair lacking density. With a non-greasy formula enriched with Stemoxydine to awaken dominant hair follicles and Reservitol for powerful antioxidants, this hair serum will give you visible results in no time for a thicker, more dense head of hair.