Restore strength & 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 & 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 enhanced health, strength & vibrancy after use. Suitable for chemically treated hair which is thinning.