D R Harris Medicated Shampoo doesn?t just possess a bright green formula for aesthetic purposes; the colour is indicative of the natural selections within. Chief among them is the incredible stimulating and revitalising power of Eucalyptus, which returns plenty of hydration to even the sorest of scalps. Tea Tree Oil takes a calmer approach, being included for the ease in which it calms irritation and stops uncomfortable itching dead in its tracks.