The work carried out by French Agency for Food, Environmental and Occupational Health & Safety (ANSES) has demonstrated health risks for hairdressing professionals and consumers when persulphates are used as ingredients in hair products.
Persulphate substances are used in different forms in hair bleaching products, such as powders to be mixed in a liquid, granules, creams, and ready-to-use liquids. Occupational exposure occurs by the respiratory and dermal routes, mainly during the preparation, application and rinsing of these products. Consumers can also be exposed, either when using bleaching products designed for home use or as hair salon customers.
Source: ANSES, 12 June 2019