Isdin Si Nail Strengthener 2.5 Ml

ISDIN Si-Nails Strengthener is a specialized nail treatment designed to protect and improve nail appearance. Using cationic hyaluronic acid, it helps restore natural nail health by increasing thickness, density, and durability of both nails and cuticles. The product comes in a click-pen applicator that requires activation before first use by pressing the button 25 times until moistened. It should be applied directly to clean, bare nails and not over nail polish or gel. Results can typically be seen within 14 days, though timing varies based on initial nail condition. With continued use, nails become harder, more hydrated, and less brittle, with optimal results seen after 28 days of regular application.