L'Oreal Professionnel Absolut Repair Molecular Leave-in Mask 100mlDescription How to Use Ingredients For all damaged hair textures, color treated, lightened & natural hair. When hair is damaged, its molecular structure, composed of peptides, is compromised. Hair breaks, becomes too elastic, with no movement. But most peptides are too big to be reinjected into the fiber, making damage almost irreversible. For the first time, LOral Advanced Research achieved to decompose peptides, to inject their components separately