Visibly longer nails in 5 days! (Nail tip measurement). What it is: Rescue your nails with this professional-strength treatment that eliminates brittleness, protects against splitting, tearing and encourages growth. How it Works: Our exclusive soy protein formula helps strengthen and lengthen nails. Keratin helps protect nails from damage while collagen and multi-vitamins promote healthy nails. The Results: Longer, stronger, more beautiful nails in just five days. Salon tested. sallyhansen.com. America's No. 1 nail brand. Made in USA.