Nioxin System 4 Scalp Care + Hair Thickening Leave-In Treatment

Nioxin System 4 is a specialized leave-on treatment formulated for noticeably thinning, fine, and chemically treated hair. This volumizing formula delivers 2x fuller hair while strengthening resilience and balancing moisture levels. Enriched with antioxidants and botanicals, it creates a refreshed scalp environment essential for healthy hair growth. The added SPF 15 sunscreen provides crucial protection for exposed scalp areas against UV damage. Ideal for those seeking noticeable thickening and scalp care in one lightweight, easy-to-use treatment.