vichy dercos ultra soothing shampoo for dry hair soothes the scalp for forty-eight hours, anti-itch.Formulated with a Sensirine active complex, the Shampoo provides immediate scalp relief, helping to relieve itchiness and keep the scalp soothed for up to 48-hours. A combination of glycerine and panthenol also work within the shampoo to keep hair hydrated, soft and shiny, for hair that looks as healthy as it feels.