Keratin Mask The Al Bahri keratin hair mask is the ultimate care for thinned or damaged hair. Our hair naturally consists of 85% keratin, which means that our hair naturally looks healthy and well-groomed. However, of course, we all know how tempted it is to give our hair a (un) coloring every now and then, to use the straightening iron regularly, because to be honest, nowadays we can hardly live without it. Unfortunately, this does have a number of disadvantages. As a result, the keratin protective layer in our hair is broken down, our hair is damaged and there is not much left of it. None of this is a problem when the hair is regularly cared for with a daily dose of keratin supplement.