Keratinocytes work like tireless construction crews living across the entire surface of the skin. They begin life deep in the basal layer, tightly packed and full of energy, dividing steadily to replace cells lost every day. As they mature, they slowly climb upward, flattening out and strengthening themselves with tough keratin proteins. This steady upward movement creates a protective barrier that shields the body from heat, microbes, chemicals and constant physical friction. During this journe