We utilize product & ingredient information from retailers and/or brands sites and analyze it against industry standard data such as ECHA (European Chemicals Agency) and GHS (Global Harmonized System of Hazard Classification). You might be wondering why we wouldn't use a chemical classification system from the United States; well, unfortunately the U.S. does not have one. So we use ECHA and GHS, which are the most robust chemical classification systems in the world.