- Type
- Formaldehyde-releasing preservative
- How serious
- Moderate severity
- Evidence
- Strong evidence
Why it is flagged
The formaldehyde it releases is a leading cause of contact allergy. The EU permits it at 0.6% but since 2022 requires a "releases formaldehyde" warning above 0.001%; Health Canada caps formaldehyde used as a preservative at 0.2%.
Health topics it bears on
Sources
- Cosmetic Ingredient Hotlist: Prohibited and restricted ingredients Health Canada, 2025
- Regulation (EC) No 1223/2009 on cosmetic products (consolidated text of 1 May 2026) European Union (Official Journal of the European Union), 2026
- Commission Regulation (EU) 2022/1181 amending the preamble of Annex V to Regulation (EC) No 1223/2009 on cosmetic products European Union (Official Journal of the European Union), 2022
- Scientific advice on the threshold for the warning 'contains formaldehyde' in Annex V, preamble point 2 for formaldehyde-releasing substances (SCCS/1632/21) Scientific Committee on Consumer Safety, 2021
Also listed as
dmdm hydantoine, dmdmh, dimethylol dimethyl hydantoin, 1,3-dimethylol-5,5-dimethylhydantoin, 1,3-bis(hydroxymethyl)-5,5-dimethylhydantoin, 1,3-bis(hydroxymethyl)-5,5-dimethylimidazolidine-2,4-dione, glydant