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 and works by increasing the fullness of each strand for enhanced diameter. Encourages thicker-looking hair while refreshing the scalp and adding healthy shine to tresses.