Keratin is the major protein which is naturally present in our hair. It acts as an external protective and internal structural protein to protect the hair and keep them healthy. Due to exposure to external factors like the sun, pollution or chemicals, or changes in your lifestyle, the keratin present in the hair gets depleted. This loss is what leads to dry, damaged and dull hair. Keratin shampoo is especially useful in managing hair that is brittle or experiencing damage. Keratin shampoo contains the protein that naturally fills the gaps in your hair follicles. Keratin works by smoothing down the cells that overlap to form the hair strands. The layers of cells, called the hair cuticle, absorb the keratin, resulting in hair that looks full and glossy. Keratin also makes curly hair less frizzy, easier to style, and straighter in appearance.