Did you know that just like your skin, your hair ages too? As time and everyday aggressors take their toll, hair loses its strength, shine, and vitality. At Kérastase, we have identified 5 key signs of this biological shift: dryness, dullness, frizz, and a loss of volume and thickness. Our Chronologiste Overnight Youth Serum is designed to work in sync with your hair’s nocturnal recovery phase. Applied before bedtime, it benefits from uninterrupted time to penetrate and perform, optimizing the efficacy of its active ingredients to reverse 5 signs of hair aging. #Kerastase #Chronologiste #LuxuryHaircare #HairLongevity #HairCare