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Keratin is a fibrous protein found naturally in the hair. It acts as a protective shield against humidity, the primary cause of frizz. Over time, the hair loses keratin from exposure to the sun, the environment, styling and chemical services. The treatment is applied, penetrating the hair’s cuticle. Hydrolyzed keratin strengthens keratin bonds from within, repairing damage + smoothing the hair shaft. Keratin and additional conditioning agents help nourish + strengthen the hair, while restoring smoothness and shine.