KERATIN SHAMPOO Concerto 1 l The Concerto Shampoo, based on keratin, is a true bath of energy and vitality for devitalized and weakened hair. The amino acids contained in keratin act on the surface, repairing and strengthening the hair fiber; in depth, they close the hair cuticles and give the cuticle its solidity and smooth appearance. Furthermore, the Concerto keratin-based shampoo gently cleanses the hair without impoverishing its hydrolipidic barrier.