Vichy Pharmacy DERCOS Anti-Pelliculaire Shampooing Traitant. A shampoo treatment that fights dandruff even the most problematic. From the first application the scalp is released and is completely clean. The hair is transformed adopting a new vitality and shine. After six weeks the problem has completely disappeared and you will enjoy healthy and silky hair. Free of sulfates, parabens and dyes. Perfect for dry hair.