Amplify your hair with NIOXIN 3-part System 5 Scalp & Hair Treatment for Chemically Treated Hair with Light Thinning. The final step in NIOXIN's 3-part regime, the leave-on scalp treatment has been specially developed for chemically-treated hair experiencing light thinning. Working to refresh the scalp while improving hair volume, the professional hair formula utilises Transactiv Delivery System 2.0 & works by increasing the fullness of each strand for enhanced diameter. Encourages thicker-looking hair while refreshing the scalp & adding healthy shine to tresses.