Vichy dercos anti dandruff shampoo for oily itchy scalp helps to tackle and prevent against further outbreaks of dandruff while providing refreshing effetive cleansing for oily limp hair types the result hair is left feeling silky soft flake free more manageable and with a radiant healthy sheen scalp is left thoroughly cleansed hydrated and soothed from the unrepentant aggravation of dandruff and excess oils dandruff is caused by a micro organism that develops at the hairs roots it