FOR MEN AND WOMEN How do they work? The fibers are made of the same protein that makes up hair, the Keratin. Thanks to its composition and micro-electromagnetic charge, to be applied is attached to the hair providing a better appearance, thickness and avoiding the visibility of the skin. They provide a natural hedge because they blend with your own hair. Keratin Natural Fiber is compatible with all treatments for hair loss, since being an organic product can be used without interfering with their action.