Nioxin 3D Styling Thickening Hair Gel provides thinning hair with definition and hold.As part of the Nioxin professional hair styling products line, this hair styling gel gives a noticeable volume boost and a fuller end look. Nioxin thickening hair gel provides strong hold and texture for fuller-looking and smooth-feeling hair, without stiffness or stickiness. Nioxin is the N°1 Salon Brand for thicker and fuller hair with more than 30 years expertise in thinning hair.