Nioxin's System 4 treatment is a specially formulated hair care solution for natural to visibly thinning, chemically treated hair. As an essential component of the Nioxin hair care system, this treatment aims to strengthen hair resilience, improve the texture of fine hair and create an environment conducive to healthy hair growth. Applied directly to the scalp, System 4 works in synergy with the other products in the system to promote stronger, denser, more resilient hair.

After using Nioxin System 4 shampoo and conditioner, apply Scalp Treatment to scalp and hair. Massage gently to promote absorption. Do not rinse. Scalp Treatment is designed to stay in place to continue working.