Overnight Youth Serum by Kérastase is a night treatment infused with Pro-Xylane™ and Ochrophyta Algae, designed to reverse the visible signs of ageing during nighttime.

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 molecule known for its anti-ageing 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 flawless finish and enveloping hair with the signature Chronologiste fragrance that turns routine care into a luxurious ritual.

HAIR BENEFITS AFTER 1 NIGHT
Up to 66% less frizz*
Up to 32% more shine*
Up to 92% less breakage*
77% say their hair feels revitalised**

*Instrumental test after 1 use of Overnight Youth Serum
**Consumer test after one application of full Chronologiste routine, bain+masque+Overnight Youth Serum