Cosmetic ingredient dictionary
DMDM Hydantoin in cosmetics: what it is and what it does
DMDM Hydantoin is a cosmetic ingredient that keeps the product from spoiling. The EU lists it as an allowed preservative, with a maximum amount. Open Beauty Facts finds it in 268 products, most often shampoos.
By Bravoora teamUpdated Sources checked 3 sourcesHow we check
What does DMDM Hydantoin do in a product?
In a cosmetic product, DMDM Hydantoin keeps the product from spoiling. The EU’s CosIng database lists this job for it: preservative.
What other names and numbers does DMDM Hydantoin have?
- CAS number
- 6440-58-0
- EC number
- 229-222-8
- CosIng reference
- 33723
Is DMDM Hydantoin restricted in the EU?
It is allowed, on a list with limits. The EU lists it as an allowed preservative, with a maximum amount (Annex V of Regulation 1223/2009, entry 33).
The annex entry sets the exact limits, the products it may be used in and any warning the label must carry.
Which products contain DMDM Hydantoin?
Open Beauty Facts finds DMDM Hydantoin in the ingredient lists of 268 of the 22,021 products it has a list for, most often shampoos, hair care and shower gels.
Products with it, by country of sale: France 104 · United States 43 · Canada 19 · Australia 15.
Counted on 13 October 2026 from Open Beauty Facts, which volunteers fill from real packs: it shows where DMDM Hydantoin turns up, not how much of the market it is.
Bravoora reads this ingredient for everyone you shop for: an allergy or intolerance, a vegan or vegetarian diet, a calorie or protein goal, and the labels on supplements and skincare too. Build a profile · For dermatologists, dietitians and doctors
Sources
The job, the description and the EU annex entry are CosIng’s; the fragrance allergens are the EU Annex III names Bravoora’s label checker reads; the product counts are Open Beauty Facts’.
- European Commission: CosIng cosmetic ingredient database (functions, description, EU annex entry)
- Open Beauty Facts: product database, 77,506 products, read 13 October 2026, ODbL
- EU Regulation 1223/2009 on cosmetic products (the annexes)
Contains information from Open Beauty Facts, which is made available here under the Open Database License (ODbL). Read the licence · Download this dictionary’s data · How we check
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