POTASSIUM BROMATE.

Potassium Bromate is not an ingredient commonly 'dusted' or found in precision skincare due to significant and widely recognized safety concerns. While it was historically permitted up to 10.17% in specific, restricted hair permanent wave formulations by the CIR, this approval is heavily contradicted by its classification as a possible human carcinogen by the IARC and its outright ban in cosmetic products within the European Union. For any reputable skincare application, a concentration above 0% is considered a red flag.

The CIR Expert Panel concluded that Potassium Bromate may be used in permanent wave formulations at concentrations not exceeding 10.17% (measured as Sodium Bromate), noting poor skin absorption and a mild sensitizer potential. However, this is largely superseded by significant regulatory concerns: it is explicitly prohibited in cosmetics and personal care products in the European Union, and the International Agency for Research on Cancer (IARC) classifies it as a Category 2B carcinogen (possibly carcinogenic to humans). The FDA has urged bakers not to use it in food since 1991, and California will ban its use in food products effective 2027. These overriding safety classifications render its use in skincare highly inadvisable.