Kérastase Symbiose Anti Dandruff TreatmentThe Benefits: This daily, anti dandruff night serum soothes and hydrates scalp & hair prone to dandruff. It is ideal to use at night as it provides effective anti dandruff care and works to give you softer, shinier, 2X more hydrated hair* while you sleep. Easy to use and a great way to recharge overnight, this highly concentrated night serum is formulated with salicylic acid, a powerful active ingredient to help eliminate the symptoms of dandruff.