Hair is made up of protein. Every touch every treatment every style you love—it all rewrites your hair’s protein. When protein is damaged hair’s look and feel is compromised. That’s why Nexxus uses protein science not just to repair hair but to restore its ability to perform. It isn t about one perfect hair day. It s about a lifetime of healthy hair built strand by strand. Frequent heat styling and chemical processing can break down disulfide bonds and strip essential amino acids leading to cuticle erosion and damage deep within the hair fiber. This makes strands weak dull tangled harder to style and less smooth and shiny.