Nioxin Hair Booster is an intensive leave on booster for areas of concern, such as the hairline or crown. Dual action technology for protection accompanied by sensation. Technologies: Ultra-concentrated formula with CoZyme-10 Vitamin Complex, especially designed for areas of low density and advanced thin-looking hair with dual-action technology. Keratin to boost fragile hair by helping protect against cuticle damage. Methyl Nicotinate to provide a warming sensation.