Vichy Dercos Anti-Pelliculaire Anti-Dandruff Shampoo — clinical-strength selenium sulfide formula eliminating up to 100% visible flakes from first wash while rebalancing scalp microbiome. Micronized Selenium Sulfide (0.6%) + Niacinamide soothe itch/redness; Salicylic Acid clears sebum plugs enabling cleaner follicular nutrient uptake. Same authentic formula as international pharmacy retail at HubNax discount pricing — no grey-market uncertainty, zero counterfeit concern.