NIOXIN Night Density Rescue is clinically proven to promote hair density in 3 months. Thin looking hair can be impacted by scalp surface oxidation. Inspired by the body's nightly regeneration process, NIOXIN Night Density Rescue with Nioxydine24 has been engineered to effectively promote hair density through a powerful blend of antioxidants known to neutralize free radicals on the scalp surface. Application Tip: Apply 2-4 droppers on scalp at night before bed. Use on dry or damp hair. Massage to distribute evenly. DO NOT RINSE. For daily use.