Nioxin Scalp + Hair Thickening System 2 Leave-On Treatment is a lightweight, leave-in foam designed to reinforce and volumize fine or naturally thin hair. Tailored for hair that’s normal-to-thick but showing signs of early thinning, this formula helps strengthen hair at the root, protect from breakage, and maintain fuller-looking volume. Applied after washing, it absorbs quickly without residue, supporting the appearance of denser, more resilient strands.
