A combination of Cynateine HNS, Vitamin B complex and zinc. Keratin is the main building block of hair and nails and makes up 80% of the chemical composition of hair. Keratin that builds hair and nails is made up of amino acids that are linked in an alpha coil. It contains larger amounts of the amino acid cysteine which bind to disulfide bonds and form cystine. The double bonds cross-link the keratin chains. The number of bonds depends on the type of hair, and a larger number ensures better strength and shape of the hair and resistance to chemicals and mechanical damage. The liquid form of keratin ensures faster absorption and greater efficiency, which contributes to the beauty of your hair in the long run.