Luxurious overnight age-corrective leave-in hair serum for aging hair. YOUTH REVITALIZING CARE. WAKE UP TO VISIBLY FULLER, SMOOTHER, HEALTHIER HAIR* An overnight age-corrective leave-in serum infused with Pro-Xylane™ and Ochrophyta Algae. This luxurious leave-in formula reverses the 5 signs of hair aging. It deeply hydrates, smooths, and builds body from root to tip while providing 450°F heat protection. To maximize the results, combine with the rest of the Chronologiste range *USING FULL CHRONOLOGISTE SYSTEM OF BAIN, MASQUE+OVERNIGHT SERUM Overnight Youth Serum by Kérastase is an age-corrective night treatment infused with Pro-Xylane™ and Ochrophyta Algae, designed to reverse the visible signs of aging during night time. Targeting dryness, dullness,frizz, lack of volume and thickness, this leave-in serum delivers intensive overnight care. Just one pump to deliver powerful actives deep into the hair. Powered by Pro-Xylane™, a green chemistry molecule known for its ultimate anti-aging action, and Ochrophyta Algae, the fastest growing algae in the world, a bio-sourced deep sea treasure that captures the regenerative power of the ocean. Its transformative quick-break texture melds instantly into the hair's lengths, leaving a perfect finish and enveloping the hair with the signature Chronologiste fragrance that turns routine care into a luxurious ritual. HAIR BENEFITS AFTER 1 NIGHT INCREASES FIBER DIAMETER BY +5.7%* -66% FRIZZ* +32% SHINE* +92% MORE STRENGTH * 77% SAY THEIR HAIR FEELS REVITALIZED** *Instrumental test after 1 use of Overnight Youth Serum **Consumer test after one application of full Chronologiste routine, bain+masque+Overnight serum HOW TO USE Step 1: before bedtime, your hair can be either dry or damp. Step 2: take one pump of the overnight youth serum into your hands. Step 3: Gently spread the serum between your palms and distribute it evenly through the lengths and ends of your hair. There's no need to apply it directly to the scalp unless specified for specific concerns. Step 4: do not rinse in the morning. Let the serum work its magic as you sleep KER_chronologiste_bainregenerantshampoo_keyingredient1 Pro-Xylane™ A powerful bio-derived sugar molecule that boosts hair thickness and density by stimulating cellular activity within the scalp and hair follicles. KER_chronologiste_bainregenerantshampoo_keyingredient2 Ochrophyta Algae A bio-sourced marine extract rich in regenerative minerals, protecting hair against daily agressors and providing deep revitalization REVERSES 5 SIGNS OF AGING IN 1 NIGHT* WAKE UP TO FULLER, SMOOTHER, HEALTHIER HAIR Like your skin, hair is aging too. After decades of scientific rsearch, Kérastase has decoded the science behind hair aging. Chronologiste brings skincare science to haircare, promising to reverse the 5 visible signs of aging* *dryness, dullness, lack of volume and thickness, and frizz. FULL INGREDIENT LIST AQUA / WATER / EAU • DIMETHICONE • GLYCERIN • ISOPROPYL MYRISTATE • PHENOXYETHANOL • POLYACRYLAMIDE • C13-14 ISOALKANE • LAURETH-7 • BENZYL SALICYLATE • HEXYL CINNAMAL • BENZYL ALCOHOL • LINALOOL • TETRAMETHYL ACETYLOCTAHYDRONAPHTHALENES • CARVONE • CITRUS AURANTIUM PEEL OIL • LIMONENE • POGOSTEMON CABLIN OIL • CITRONELLOL • LINALYL ACETATE • GERANIOL • HYDROXYCITRONELLAL • MACROCYSTIS PYRIFERA EXTRACT / KELP EXTRACT • HYDROXYPROPYL TETRAHYDROPYRANTRIOL • BENZALDEHYDE • GERANYL ACETATE • COUMARIN • CITRIC ACID • TRIMETHYLBENZENEPROPANOL • ROSE KETONES • PROPYLENE GLYCOL • BETA-CARYOPHYLLENE • POTASSIUM SORBATE • SODIUM BENZOATE • PARFUM / FRAGRANCE