L'Or?al S.A. is a French cosmetics company headquartered in Clichy, Hauts-de-Seine[3] with a registered office in Paris.[4] It is the world's largest cosmetics company and has developed activities in the field of cosmetics, concentrating on hair colour, skin care, sun protection, make-up, perfume and hair care; the company is active in dermatology, toxicology, tissue engineering, and biopharmaceutical research fields and is the top nanotechnology patent-holder in the United States