We cross-reference ingredient information with lists of prohibited ingredients from government and non-profit health and environmental groups. Due to lack of formal government regulations, most of these lists are guidelines only, but they are backed by scientific studies with abstracts which are available to the public. We take the health impacts of cosmetics seriously, so if there’s enough evidence showing that even a single ingredient is unsafe, it will be listed as “Dirty” on the “Dirty Meter”. The ratings are strictly based on our own interpretation; other sources could have their own opinions. For more information, please tap the Ratings box on the Product screen, or you can also review our Terms of Service.
For a detailed overview, please review our Methodology section that will also give you a clearer picture!