KERATIN SHAMPOO Concerto 1 l The Concerto Shampoo with 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, closing the hair cuticles and giving the cuticle its solidity and smooth appearance. Furthermore, the Concerto shampoo with keratin gently cleanses the hair without depleting its hydrolipidic barrier.