What is Isdin SI-Nails nail hardener? This product is made with cationic hyaluronic acid, an active ingredient that improves cuticle hydration . Its exclusive formula provides hydration, keratin and silicone for enhanced protection and care. It also helps strengthen and promote nail growth. Who is it for? Designed for all those who need to care for, protect, moisturize and strengthen their nails . Advantages It is an invisible finishing product that provides visible results in just 14 days. Instructions for use Apply daily to clean (without nail polish) and dry nails. Run the moistened brush along the entire edge of the nail and cuticle. Repeat the application with vertical movements from the inside out, covering the entire surface of the nail. If possible, run the brush under the nail. Pharmaceutical recommendation This product is for external use only. If you experience any symptoms, discontinue use. If you have any questions about Isdin SI-Nails nail hardener, consult your pharmacist at Farmaciasdirect. Composition Cationic hyaluronic acid, mastic oil (Pistacia Lentiscus), organic silicon.