When hair is damaged, its molecular structure, composed of peptides, is affected. Damaged hair becomes rubbery and loses its movement. Most of the peptides are too large to be reinjected, making the damage almost irreversible.

For the first time, L'Oréal Advanced Research has succeeded in breaking down peptides, to reinject their components separately inside the fiber¹. Once inside, they reform and rebuild the molecular structure of the hair².