HAIRHORN Keratin is the type of protein that makes up your hair. Since keratin is the structural building block of your hair, some people believe that keratin supplements, products, and treatments can help strengthen your hair and make it look healthier. A good keratin shampoo can make the hair more damage-resistant and repair hair that has been dried out by heat and hair dye. It is not like your regular shampoo because it goes far and beyond what the latter can do. While it cleans the hair and rids it of buildup, a keratin smoothing shampoo strengthens the hair by fortifying the cuticles that form each hair shaft. Here we have a list of the best keratin shampoos for you to choose from.