The Nioxin System 1 Leave-In Scalp & Hair Treatment For Natural Hair With Light Thinning, Refresh The Scalp And Increase Your Hair Volume. This Volumizing Leave-On Treatment Helps To Provide Thicker-Looking Hair By Increasing The Fullness Of Each Hair Strand. Nioxin Scalp & Hair Treatment Is The Final Step Of The 3-Part System, Which Amplifies Hair Texture While Protecting Against Breakage.How To Use:Apply On Damp Hair & Scalp Up To 9 Pumps Evenly On The Scalp, Massage And Comb. Don`T Rinse. Style As Usual. Use Daily