What two ingredients commonly compose protein hardener?

The combination of clear polish and collagen in a protein hardener is significant for its effectiveness. Clear polish provides a protective and glossy finish while allowing the other ingredients to penetrate and strengthen the nails. Collagen, a vital protein found naturally in the body, helps to improve nail strength and resilience, promoting healthier nail growth.

This formulation is designed to reinforce the nails by creating a barrier that prevents breakage and splitting. The inclusion of collagen not only adds strength but also supports hydration and flexibility, which are essential attributes for maintaining healthy nails. This synergy between the clear polish and collagen is what makes this option the most appropriate choice for a protein hardener.