Wake up to revitalised, hydrated, and silky-soft hairKérastase Chronologiste Serum Overnight Youth Serum provides intensive overnight care, targeting multiple concerns such as dryness, dullness, frizz, lack of volume, and reduced thickness. While you sleep, its restorative formula works to reverse visible signs of ageing, helping hair regain its natural vitality and strength. By morning, strands feel fuller, smoother, healthier, and beautifully revived, with a soft touch and renewed shine. Infused with a delicate fragrance, it turns your nighttime routine into a calming, sensory ritual while delivering transformative results.