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Hair is made up of three layers:Three layers of Hair are cuticle layer, cortex layer, and medulla layer.The cuticle is where ceramides can be found on your scalp's surface while they are also located in your hair's cortex which helps them repair damaged cells faster than ever before! The cortex layer of a hair strand is where keratin is found as well as sebum which helps keep your hair healthy, shiny and smooth!The medulla layer of a hair strand can adjust in response to increased humidity so th …