LOreal Elvive Anti Dandruff Active Selenium Shampoo Treatment contains a unique formula which harnesses the power of Active Selenium S, an effective weapon against dandruff. Its soothing formula covers the scalp evenly and acts. Very fast, Attacks from the first use to reduce even persistent flakes and quickly soothes the scalp. Long lasting, So effective, see results for up to 4 weeks, even if you stop using it.