The miracle hardener that instantly strengthens and helps regenerate soft or damaged nails. Highly concentrated in plant keratin, silicon and biotin, its biomimetic formula densifies the nail plate. Its fluid texture is absorbed immediately for a deep and targeted action. 10% concentrated formula: Plant keratin: intensely nourishes fragile nails. AHAs & Gluconolactone: gently exfoliate the nail plate. Silicon: helps strengthen the nail. Biotin (Vitamin B8): contributes to hardening and strengthening. Vitamin C: protects against external aggressions. Proven visible results: 85% notice their nails are harder* 81% feel them stronger* 81% perceive fewer breakages* Easy and quick application: Its fluid, alcohol-based texture absorbs instantly without leaving a greasy or sticky finish. Formulated with 97.5% naturally derived ingredients.** How to use (Keratin Booster): Apply 1 to 3 times a day to the clean nail using the brush. Allow to dry completely until fully absorbed. Repeat daily for 5 to 7 days. If you wish to apply nail polish afterwards, degrease the surface of the nail for better adhesion. *Clinical test under dermatological supervision on 25 people after 2 weeks. **Calculation according to the international standard ISO 16128.