Thick, bouncy hair that’s full of life Fed up with dull, flat and lifeless hair? If so, Nanogen have the answer: Root Boost Hair Thickening Spray; a salon blow dry in a bottle. Our easy to use spray is designed to add instant thickness and volume to your hair in just a few sprays. Our scientifically formulated Root Boost Hair Thickening Spray contains keratin, lifting polymers and a thickening combination of caffeine and soothing niacinamide to care for your scalp. Heat activated proteins protect against damage from blow-drying and give your hair extra volume.