Nioxin 3D Intensive Hair Booster is a professional leave-in treatment that protects weak and thinning hair from damages causing hair loss while hydrating. Benefits Provides weak hair with strength. Thickens hair. Technology Enriched with CoZyme-10 Vitamin Complex, a double-action technology that increases hair density in areas of advanced thin-looking hair such as the hairline or crown. How to use Apply the Hair Booster after the most suitable Nioxin Scalp & Hair Treatment, depending on the hair needs. Distribute with the fingertips from roots to ends on areas of advanced thin-looking hair and along the hairline. Use this product twice a day for best results.