- Deeply nourishes the weakened hair fiber, leaving your hair soft, shiny, softer and easier to detangle. Apply to towel-dried hair and leave for 3-5 minutes before rinsing thoroughly 1-2 times a week. Damaged hair is left stronger, with a nourished fiber and surface protected from aggressions. Lipidium Complex: This L'Oréal Professionnel exclusive technology is designed to target each part of the hair fiber to treat damaged hair.