Nioxin Pro Clinical's System Kit 4 is designed for dry, damaged, color-treated hair with progressed thinning. Clinically and dermatologically tested, this shampoo nourishes and gently cleanses your hair to prevent against follicle-clogging sebum, resulting in thicker, fuller hair. Formulated with a powerful blend of wild mint oil, peppermint oil, and salicylic acid.