The Nioxin System 4 Step 3 Scalp & Hair Treatment for Colored Hair with Progressed Thinning is a diameter increasing leave on treatment that thickens hair.

Using the Transactive Delivery System 2.0 which thickens hair. For optimal results use with System 4 Cleanser Shampoo and Scalp Therapy Revitalizing Conditioner.

Shake the bottle well and then apply evenly to the entire scalp. Do not rinse.