Increase the thickness of each existing hair strand for fuller looking hair. Nioxin Dia Boost is a cosmetic Thickening Xtrafusion Treatment, scietifically designed & tested to increase the thickness of each of your existing hair strands for fuller looking hair. Nioxin Dia Boost, with a fusion of Niacinamide, Panthenol & Caffeine, is proven to: 1. Increase the diameter of each existing hair str&. 2. Penetrate hair & make it manageable & full-looking. 3. Strengthen hair resilience against breakage.