Mavala Scientifique K+ is a professional nail hardening treatment that strengthens weak and brittle nails. This Swiss-made formula contains pro-keratin to improve nail structure and prevent splitting, peeling and breaking. The product should be applied to clean, polish-free nails. For best results, apply to the tips of nails where they are most fragile and prone to breaking. The formula works by improving keratin fiber cohesion and bonding the nail's layers together. This is not a base coat or nail polish, but rather a penetrating treatment solution. Regular use helps achieve and maintain stronger, more resilient nails.