Boost thinning-hair protection with Nioxin’s 3D Intensive Hair Booster Cuticle Protection Treatment. This leave-on professional treatment with KeraPro Complex is particularly designed for progressed-thinning hair and works on specific areas of concern, such as a receding hairline or a low- density crown. This Nioxin Intensive Treatment conditions hair and forms a protective barrier against cuticle damage. Nioxin’s 3D Intensive diameter-protect Hair Booster with Vitamin Complex gives a warming sensation after application. leave-on cuticle protection professional treatment for hair with progressed thinning, conditions hair and forms a protective barrier against cuticle damage, for specific concerns such as receding hairline or low-density crown and diameter-protect.