Other ConcernsUse restrictions (moderate), Irritation (skin, eyes, or lungs) (moderate), and Contamination concerns (high)
SYNONYMS1,3-BIS(HYDROXYMETHYL)-5,5-DIMETHYL- 2,4-IMIDAZOLIDINEDIONE, 1,3-BIS(HYDROXYMETHYL)-5,5-DIMETHYLIMIDAZOLIDINE-2,4-DIONE, 1,3-BIS(HYDROXYMETHYL)-5,5-DIMETHYLIMIDAZOLIDINE-2,4-DIONE(+), 1,3-DIHYDROXYMETHYL-5,5 DIMETHYLHYDANTOIN, 1,3-DIMETHYLOL-5,5-DIMETHYL HYDANTOIN, 2,4-IMIDAZOLIDINEDIONE, 1,3-BIS(HYDROXYMETHYL)-5,5-DIMETHYL-, 2,4IMIDAZOLIDINEDIONE, 1,3BIS(HYDROXYMETHYL)5,5DIMETHYL, DMDM HYDANTOIN, and DMDM HYDANTOIN (FORMALDEHYDE RELEASER)
Restricted: EWG VERIFIED products cannot contain this ingredient without adequate substantiation
DMDM hydantoin is an antimicrobial formaldehyde releaser preservative. People exposed to such formaldehyde-releasing ingredients may develop a formaldehyde allergy or an allergy to the ingredient itself and its decomposition products. In the U.S., approximately 20% of cosmetics and personal care products contain a formaldehyde-releaser and the frequency of contact allergy to these ingredients is much higher among Americans compared to studies in Europe.
See how this product scores for common concerns.
HIGHAllergies & Immunotoxicity
LOWDevelopmental and Reproductive Toxicity
- DATA SOURCES
Products with this Ingredient
|body wash/cleanser||71 products|
|liquid hand soap||59 products|
|hair styling aide||58 products|
|styling gel/lotion||38 products|
|hair treatment/serum||34 products|
|facial moisturizer/treatment||22 products|
|facial cleanser||16 products|
|styling mousse/foam||13 products|
|hand cream||8 products|
|foot moisturizer||5 products|
|daily use with SPF||5 products|
|body firming lotion||5 products|
|baby wipes||5 products|
|hand sanitizer||4 products|
|hair spray||4 products|
|serums & essences||4 products|
|after sun product||4 products|
|eye liner||3 products|
|after shave||3 products|
|sunless tanning||3 products|
|recreational sunscreen||3 products|
|bubble bath||3 products|
|makeup primer||2 products|
|BB cream||2 products|
|brow liner||2 products|
|body spray||2 products|
|beard care||2 products|
|beard cleanser||1 products|
|around-eye cream||1 products|
|antiperspirant/deodorant (men's)||1 products|
|nail polish||1 products|
|hair relaxer||1 products|
|baby shampoo||1 products|
|baby lotion||1 products|
|hair removal waxes||1 products|
|hair color and bleaching||1 products|
|makeup remover||1 products|
|foot cleansing||1 products|
|bath oil/salts/soak||1 products|
|shaving cream (men's)||1 products|
|Known human immune toxicant or allergen||Open scientific literature|
|Human skin toxicant or allergen - strong evidence||Cosmetic Ingredient Review Assessments|
|Limited evidence of immune system toxicity or allergies||National Library of Medicine HazMap|
Irritation (skin, eyes, or lungs)
|Human any irritant - strong evidence||Cosmetic Ingredient Review Assessments|
|Restricted in cosmetics (recommendations or requirements) - use, concentration, or manufacturing restrictions - Japan - prohibited for use in some types of cosmetics||Japan's Standards for Cosmetics|
|Cancer - limited evidence||Open scientific literature|
|Risk assessment method deficiencies and data gaps - Maximum reported "as used" concentration is basis of safety assessment by industry safety panel (Cosmetic Ingredient Review, CIR) - implicit safe concentration limit in product||Cosmetic Ingredient Review Assessments|
|24 studies in PubMed science library may include information on the toxicity of this chemical||NLM PubMed|
|Industry or government recommendations for safe use: restrictions on concentration, impurities, product types, or manufacturing methods - any||Cosmetic Ingredient Review Assessments|
|Not suspected to be an environmental toxin||Environment Canada Domestic Substance List|
Organ system toxicity (non-reproductive)
|Classified as not expected to be potentially toxic or harmful||Environment Canada Domestic Substance List|
Persistence and bioaccumulation
|Not suspected to be persistent||Environment Canada Domestic Substance List|
|Not suspected to be bioaccumulative||Environment Canada Domestic Substance List|
- Open scientific/peer reviewed literature
- CIR (Cosmetic Ingredient Review). 2006. CIR Compendium, containing abstracts, discussions, and conclusions of CIR cosmetic ingredient safety assessments. Washington DC.
- NLM (National Library of Medicine). 2006. HazMap — Occupational Exposure to Hazardous Agents.
- Japan Ministry of Health, Labour and Welfare. 2006. Standards for Cosmetics. Evaluation and Licensing Division. Pharmaceutical and Food Safety Bureau.
- NLM (National Library of Medicine). 2012. PubMed online scientific bibliography data. http://www.pubmed.gov.
- EC (Environment Canada). 2008. Domestic Substances List Categorization. Canadian Environmental Protection Act (CEPA) Environmental Registry.
Cosmetics and personal care products are not required to be tested for safety before being allowed on the market. The Skin Deep® scoring system was designed to help the public understand whether a product is safe to use or whether it contains ingredients of concern.
Every product and ingredient in Skin Deep gets a two-part score – one for hazard and one for data availability. The safest products score well by both measures, with a low hazard rating and a fair or better data availability rating.HOW WE DETERMINE SCORES
The Skin Deep ingredient hazard score, from 1 to 10, reflects known and suspected hazards linked to the ingredients. The EWG VERIFIED™ mark means a product meets EWG’s strictest criteria for transparency and health.
The Skin Deep data availability rating reflects the number of scientific studies about the product or ingredient in the published scientific literature.