The main ingredient of human hair is a protein called keratin, which is also found in human skin, teeth, fingernails and toenails. Hair also includes oils for texture and a chemical called melanin. Human hair is also made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft.