Kerastase Symbiose Serum Nuit Antipelliculaire Intensif is an intensive overnight anti-dandruff serum designed to combat flakes and soothe the scalp. Formulated with targeted ingredients it works while you sleep to reduce the appearance of dandruff and promote a healthier scalp environment. Wake up to a revitalized scalp and beautifully conditioned hair with this Kerastase night treatment.