You might not have heard of keratīns before, but you’re probably familiar with them. Keratīns are a family of proteins that are responsible for the strength and structure of your hair, skin, and nails. In fact, they’re the main component of your hair and nails! You may have heard of keratīns before, but what exactly is it? Keratīns are protein that naturally occurs in our hair, skin, and nails. It’s responsible for helping to keep these structures strong and healthy. However, exposure to UV rays, pollution, and other harmful environmental factors can break down keratīns and lead to damage.