100% dandruff-free hair is possible (visible dandruff, with daily use) With pyrithione zinc compound that has been clinically tested. When compared to a competitor's anti-dandruff shampoo containing 1% pyrithione zinc, it effectively combats dandruff. 3 Action Formula: hydrates, protects, and cleans the hair and scalp (with regular use) For hair that feels deep, clean, and looks healthy