Kérastase’s new Chronologiste Overnight Youth Serum is here. Be the first to experience targeted night care that optimizes your hair’s natural recovery. Applied before bedtime, it works while you rest to reverse 5 signs of hair aging in one night: frizz, dryness, dullness, lack of thickness, and lack of volume. Wake up to visibly fuller, healthier, and smoother hair at dawn. Exclusively available at Sephora. #Kerastase #Chronologiste #HairYouth #OvernightRecovery #SephoraExclusive