This Nioxin 3-Part System 4 Scalp Therapy Conditioner is specifically formulated for hair with progressed thinning and color-treated hair. It works to cleanse and refresh the scalp while providing lightweight moisture and density support to the hair strands. Designed as part of a comprehensive three-step system, this conditioner helps create an optimal environment for healthy hair growth by strengthening the hair structure and improving manageability. Regular use complements the full system treatment for visibly thicker-looking hair.