The Rio Hair Naturalizer System was a hair relaxer distributed by The World Rio Corporation Inc. It was available in two types; "Neutral" as well as another one that claimed to have a "Color Enhancement Formula" that contained a black hair dye.[1] As a product designed for home use, it was promoted through infomercials in the early to mid-1990s.
Despite the claims of the relaxer being safe and natural, the product contained copper, ammonium, and chloride salts and a pH of less than the listed level of 3.[2] Due to these factors, people using the product suffered from hair loss, scalp burns, and (in some cases) green hair color.[3] By 1995, there were over 3,000 complaints lodged with the Food and Drug Administration. Eventually, the product was barred from being imported into the U.S., and all remaining company stocks were destroyed.[4] Several victims (about 53,000) filed a Class Action Lawsuit against World Rio Corporation, resulting in a judgment of US$4.5 million. The incident also raised questions about the issue of relaxing afro textured hair in general.[5]