Because keratin has restructuring qualities, Restructuring Shampoo with Keratin Protein nourishes and rebuilds dry and damaged hair, regenerating the hair fiber. From the first use, this Black Professional shampoo provides a deep cleaning action that leaves hair looking noticeably healthier, shinier, and more volumized. For everyday use, even on chemically treated, depleted, and severely damaged hair, its mild, salt-free formula is perfect.