REACH is a European Union regulation that addresses the production and use of chemical substances and their potential impacts on human health and the environment. It requires companies to register manufactured or imported chemical substances and provides authorities with powers to check companies are managing risks appropriately and substituting potentially dangerous chemicals. Substances of very high concern require authorization for use. REACH also updates chemical labeling and safety data sheet requirements. The key requirement is that companies must evaluate chemical hazards and demonstrate appropriate risk management measures are implemented across the supply chain.