Kérastase Resistance Serum Extentioniste is a restorative serum designed specifically for damaged and weakened hair. This professional-grade formula works deeply to revitalize the hair fibers, enhancing their strength and resilience. Enriched with ceramides, the serum targets the scalp and hair to encourage healthy growth and reduce breakage. Its leave-in characteristics allow for ongoing protection and nourishment, making hair more manageable and less prone to damage. Apply a few drops to towel-dried hair, focusing on the lengths and ends to achieve optimal results.