Keratin Complex is a brand of hair care products that focus on restoring and maintaining healthy hair. The key ingredient is keratin, which is a protein that is naturally found in hair. Keratin Complex hair care products aim to replenish and strengthen hair by infusing it with keratin, which can be lost due to environmental stressors, chemical treatments, and aging. These products can be used on all hair types and are especially beneficial for those with damaged, chemically treated, or frizzy hair.