KÉRASTASE Overnight Youth Serum — Chronologiste Anti-Aging Night Serum 90ml, Hydrating & Smoothing

KÉRASTASE Chronologiste Overnight Youth Serum is a leave-in night treatment that hydrates, fortifies and restores shine while you sleep.

Designed as an intensive overnight ritual for mature, weakened or dull hair, this 90ml serum combines advanced actives—hyaluronic acid, Abyssine®, Pro‑Xylane™ and Ochrophyta algae—to replenish moisture, reduce frizz and smooth fiber surface without rinsing. Lightweight and non-greasy, it’s formulated to absorb into strands overnight so hair wakes softer, more resilient and visibly glossier.

How does the Overnight Youth Serum work while I sleep?

The formula targets hydration, surface smoothing and fiber strength during the night when hair is less exposed to styling stress. Fast-absorbing ingredients lock in moisture and help restore elasticity so fibers recover from daily wear. You don’t need heat or a special device—application is simple and passive.

• Hyaluronic acid attracts and retains water to plump the hair cuticle.
• Abyssine® soothes and defends the fiber from oxidative stress.
• Pro‑Xylane™ and Ochrophyta algae work to reinforce the hair structure and reduce breakage.
• Light texture penetrates without leaving residue or weighing hair down.

Will it reduce frizz and increase shine after one use?

Clinical-style data from the formula’s sensory testing shows noticeable smoothing and shine improvements after a single application when used as directed. The blend seals the cuticle and smooths irregularities, producing visible gloss and reduced flyaways by morning. Results depend on hair type and current damage level.

• Reduces frizz by improving cuticle alignment.
• Enhances surface reflectivity for immediate shine.
• Delivers measurable strengthening against breakage.
• Non-rinse finish supports overnight treatment without transfer.

How do I use it for best results and does it suit colored or chemically treated hair?

Apply a few pumps to dry or towel-dried hair before bed, spreading evenly from mid-lengths to ends; do not rinse. Use nightly or as needed; morning styling proceeds as usual. The formulation is designed to be safe for color-treated and chemically processed hair, helping to restore moisture and texture without stripping pigments.

• Dispense a small amount and warm between palms before applying.
• Focus on lengths and ends where damage is most evident.
• Leave in overnight; style in the morning as normal.
• Suits color-treated, highlighted and chemically straightened hair.

What will I notice after continued use?

With regular nightly application, hair becomes progressively smoother, stronger and easier to manage. The combined actives help maintain moisture balance and protect fiber integrity, so styling requires less effort and results hold longer. Over time, you should see improved resilience and a healthier-looking finish.

• Increased manageability and reduced mechanical breakage.
• Progressive boost in shine and tactile softness.
• Enhanced resistance to daily styling stress.
• Long-term hydration for less frizz-prone hair.

Who is this for: KÉRASTASE Chronologiste Overnight Youth Serum is aimed at anyone seeking an effective leave-in night treatment—especially those with aging, dry, chemically treated or frizz-prone hair who want a lightweight, restorative product that works while they sleep. It’s ideal for users who prefer hands-off, nightly care to improve moisture, shine and fiber strength over time.

Ingredients

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