This is an ingredient in many cosmetic hair care products such as volumizing gels, shampoos, and volumizing and holding hair sprays. For specific chemical studies and health and safety outcomes, etc. see the links to US Government sites listed with this answer. The formula and purposes in specific brand name products is proprietary. It is also known as tert-Octylacrylamide, methyl methacrylate, acrylic acid, hydroxypropyl methacrylate, and tert-butylaminoethyl methacrylate polymer.