The Overnight Youth Serum is a night serum that repairs and smooths hair while you sleep. It is not rinsed out: in the evening, one to two pumps on dry or damp hair, spread through the lengths and ends. The serum contains Pro-Xylane and Ochrophyta algae, which Kérastase calls its 'caviar of longevity'. According to the brand's instrumental testing, after one night it works on five signs of hair ageing at once: dullness, dryness, lack of volume and thickness, and frizz. After one night Kérastase reports +5.7% fibre diameter, 66% less frizz, 32% more shine and 92% more strength. Those are brand figures, not guarantees. The serum belongs to the same Chronologiste line as the Longevity Potion: the potion targets the scalp, the serum the lengths. Come summer, when sun and chlorine put hair through extra, that kind of overnight recovery is exactly the point.
By morning it feels softer, with no trace of grease or heaviness.
Fusio-Dose — bespoke care, mixed fresh in the salon
No two heads of hair are the same, so why should the treatment be? Fusio-Dose is freshly blended in the salon to match exactly what your hair needs.
Kérastase Elixir Ultime — oil that softens hair after summer
Sun and salt water leave hair dry and frizzy after summer. Elixir Ultime, with wild camellia oil, softens lengths without weighing them down.
Chronologiste — the ritual for her and her scalp
Chronologiste isn't just another wash — it's a moment of indulgence that calms the scalp and nourishes hair from root to tip.