The sale and trade of mercury-added skin lightening products (SLPs) have continued despite widespread sampling, reporting, awareness campaigns, and legal prohibitions, including a global treaty ban. The Environmental Investigation Agency (EIA) carried out undercover investigations in three different regions (Asia, North America, and Europe) and was able to confirm the continued production, trade, and sale of mercury-added SLPs. EIA obtained compelling evidence from seven companies in three countries that they intentionally add mercury into SLPs, in violation of the Minamata Convention on Mercury. Our investigation revealed it is common practice for SLP producers across the globe to create creams consisting of 3-4% of a mercury compound.