Restore strength and shine to your tresses with the NIOXIN 3-part System 4 Scalp & Hair Treatment for Chemically Treated Hair with Progressed Thinning. Designed as the final step in the 3-part treatment process, the silky formula envelops each strand in a protective seal, helping to prevent hair loss due to breakage whilst refreshing and hydrating the scalp. The brand’s own Scalp Access Delivery 2.0 technology provides UV protection in order defend locks against colour fade, working to deliver improved health, strength and vibrancy after use. Suitable for chemically treated hair which is thinning.