Product Description Nioxin Hair Booster conditions hair and forms a protective barrier against cuticle damage. Try this root booster for hair to protect the cuticle of the hair and improve the health of the scalp. Nioxin Hair Booster is a root booster spot treatment particularly designed for progressed-thinning hair and works on specific areas of concern, such as a receding hairline or a low-density crown. It is a leave-in treatment for thinning hair that boosts thinning-hair protection and helps combat hair loss for all hair types, including curly hair loss. Features & Benefits 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. Diameter-protection.