Discover the Nioxin Scalp + Hair Thickening System 1 Leave-In Treatment, designed for natural hair with light thinning. This serum strengthens hair from within, providing thickness and fullness in 30 days. It gently cleanses the scalp, reduces hair breakage, and promotes fuller hair. Enriched with antioxidants and UV protection, it revitalizes the scalp for improved health. For best results, apply to towel-dried hair, focusing on the scalp, then style as desired. Use with Nioxin System 1 Shampoo and Conditioner for better results.