Keratin is a protein consisting of long chains of amino acids, among which cysteine prevails, in which various vitamins and trace elements are interposed. Widespread throughout the animal kingdom, in humans keratin is the main constituent of the surface layer of the epidermis, hair, hair and nails. Hydrolyzed keratin is obtained from virgin Merino wool by enzymes; thanks to its property of fixing itself on the entire cuticle of the hair, it succeeds in increasing its thickness and thus making it stronger and more full-bodied, carrying out an instant strengthening and restructuring action. It is the cosmetological treatment par excellence.