It is not clear why, from him much-presilno itchy scalp, as I have (long curly hair, oily at the roots, my couple of times a week) and my husband (short hair, wash it every day). Miracles did not notice any of it. Without air conditioning it went bad, if not for the constant itching after shampoo (other shampoos this manufacturer of special effects did not cause). Yes, and the head becomes dirty very quickly with it through the hair. After a day - it is no longer possible not to wash. I would not recommend.