Cosmetic Products Regulation, Annex III - Restricted Substances

EU. Restricted Substances: Annex III, Regulation 1223/2009/EC on Cosmetic Products, as amended by Regulation (EU) 2023/1545, OJ L 188, 27 July 2023

This list contains substances whose use in cosmetic products in the European Union is banned, except under certain conditions as indicated in Annex III. The list specifies the field of application or use, maximum allowable concentration limits in finished products, and any additional limitations.

Potassium hydroxide

EC / List no: 215-181-3 CAS no: 1310-58-3
Ref No.
Restrictions Product type, body parts
General use products for straightening hair
Maximum Threshold
2 %
For general use
Expressed As
As weight of NaOH
Warning Label
Contains alkali. Avoid contact with eyes. Can cause blindness. Keep out of reach of children.
The quantity of sodium, potassium or lithium hydroxide is expressed as weight of sodium hydroxide

In cases of mixtures, the sum should not exceed the limits given in column g

For other uses of potassium hydroxide, see Annex III, No 15d