Details: Kérastase Chronologiste Overnight Youth Serum is a transformative, age-corrective night treatment designed for hair weakened by dryness, dullness, frizz, and thinning caused by aging. Infused with Pro-Xylane, renowned for its powerful anti-aging properties, and Ochrophyta Algae, a fast-growing bio-sourced ingredient from the depths of the ocean, this serum works deep within the fibers to restore vitality and strength during the night. Its lightweight leave-in formula smooths, hydrates, and seals the hair cuticle, leaving hair softer, stronger, shinier, and full of life by morning. With its signature Chronologiste fragrance, including bergamot, rose, and patchouli, this treatment turns your routine into a luxurious ritual. Results include reduced frizz by 66%, stronger hair by 92%, and increased shine by 32% within a single use.*