Revive your locks with the Nioxin 3-part System 1 Scalp and Hair Treatment for Natural Hair with Light Thinning. The final step of the brand’s 3-part system, the treatment is designed to improve hair volume and shine. Targeting thinning hair, the leave-in treatment works to improve the fullness of individual strands thanks to its Transactiv Delivery System. The multi-tasking formula helps to leave your scalp feeling refreshed, while promoting healthier and thicker-looking hair.