As H2O2 stabilizer
Because of its H2O2 stabilizing property it is assumed that Acetaminophen occurs to some extent in cosmetic products wherein H2O2 is employed as an ingredient. The cosmetics then concerned would mainly be the oxidative hair coloring products the hair bleaching products and possibly also to some degree the tooth bleaching products.
Because of lack of data we in accordance with SCCS guidance apply the default it is present in every oxidative hair coloring / bleaching product currently being placed on the market in Europe.
The Codecheck database, mentions 13 hair coloring /hair bleaching products that according to the list of ingredients contain Acetaminophen. The molecule is together with hydrogen peroxide in
these products. These 13 products all contain 10 – 25 different ingredients each. The Acetanilide is mostly in the 9 list of ingredients of the developer- and we judge that the concentration is roughly of the same magnitude as that of two other structurally very similar H2O2 stabilizer Acetanilide and Phenacetin。