Through using advanced hair technologies, Nioxin products provide help, and more importantly results, to people experiencing thinning hair. Nioxin's System 4 Scalp Treatment works in conjunction with Nioxin's 3 way treatment system to deliver fuller looking hair and restore moisture balance for noticeably thinning, fine, chemically treated hair. It also protects the scalp. Technologies Bio AMP- Provides thicker looking hair and improves strength. Scalp Access Delivery System-Purifying agents clean away follicle clogging sebum and environmental residues from the scalp whilst also providing sun protection for the skin. Glyco-Shield- Provides protection and moisture balance to chemically treated hair while leaving the scalp feeling rejuvenated and refreshed. Directions For best use, use in conjunction with Nioxin's 3 part daily use treatment. First, cleanse with System 4 Cleanser, then apply System 4 Conditioner to wet hair and leave in between 1 and 3 minutes before rinsing out. Finally apply the leave in System 4 Scalp Treatment.