WHAT IS IT?

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 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 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 hair with the signature Chronologiste fragrance that turns routine care into a luxurious ritual.

Apply to dry or damp hair before bedtime. Spread one pump into hands and distribute evenly through lengths and ends. No need to rinse.

Wake up to fuller, healthier, smoother hair.

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

WHO IS IT FOR?
For hair weakened by signs of aging: lack of thickness, frizz, dullness, dryness, lack of volume.