The L'Oréal Paris Hyaluronic Acid Serum for hair is a 150ml leave-in styling product designed to hydrate and strengthen dry and damaged hair. Formulated with hyaluronic acid, this serum acts as a humectant to attract moisture to the hair strands, helping to protect against dryness. The inclusion of micro-particles works to smooth the hair surface, providing a shiny finish while assisting in heat protection and easier styling. To use, apply a hazelnut-sized amount to the ends of shampooed and conditioned hair, then style as desired without rinsing. For optimal results, it is recommended to use the product one or two times per week. This serum is part of a comprehensive hair care routine aimed at improving the overall texture and appearance of the hair through consistent application and proper maintenance.