Daidzein
A cosmetic ingredient used as skin conditioning in skincare, haircare, and personal-care products sold in the European Union.
What is it?
4',7-Dihydroxyisoflavone,4H-1-Benzopyran-4-one, 7-hydroxy-3-(4-hydroxyphenyl)-,7-Hydroxy-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one
What does it do?
Daidzein is listed in the EU cosmetic ingredient inventory with the following declared functions:
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Skin conditioning
improves the appearance, feel, and condition of skin
EU regulatory status
This ingredient is restricted in the European Union.
Daidzein is listed under Annex III of EU Cosmetics Regulation 1223/2009 (entry 374). It is permitted only under specific conditions, concentration limits, or in particular product types.
Notes: Restricted by Regulation (EU) 2024/996 (endocrine-disruption concerns). Maximum 0.02% in cosmetic products. Applies from 1 November 2025.
Frequently asked questions
What is Daidzein?
Daidzein is a cosmetic ingredient catalogued in the EU CosIng database. 4',7-Dihydroxyisoflavone,4H-1-Benzopyran-4-one, 7-hydroxy-3-(4-hydroxyphenyl)-,7-Hydroxy-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one
Is Daidzein allowed in cosmetics in the EU?
Only with restrictions. Daidzein is permitted in EU cosmetics only under specific conditions defined in Annex III of Regulation 1223/2009.
What does Daidzein do in cosmetic products?
Daidzein is declared in the EU cosmetic ingredient inventory with these functions: skin conditioning.
What is the CAS number of Daidzein?
The CAS (Chemical Abstracts Service) number for Daidzein is 486-66-8.
Related ingredients
Source: EU CosIng database (European Commission). This page is derived from public-sector information published by the European Commission. · Last updated: 03/04/2024