Catrice Stronger Than Ever Nail Hardener is a high-performance formula designed to help reduce brittleness, splitting, and breakage. Enriched with celery seed extract and glycolic acid, it helps nails, making them harder and more resilient, as approved by 92% of users after just two weeks of regular use*. Whether used alone as a fortifying treatment or as a base coat under nail polish, this versatile hardener helps improve the condition and appearance of nails. Its clear, quick-drying formula ensures an effortless, smooth, and glossy finish for nails. *Confirmed by an external self-assessment study with 50 women, 2 coats twice a week