Other ConcernsUse restrictions (low) and Contamination concerns (high)
SYNONYMS1-[1,3-BIS(HYDROXYMETHYL)-2,5-DIOXOIMIDAZOLIDIN-4-YL]-1,3-BIS(HYDROXYMETHYL)UREA, DIAZOLIDINYL UREA, DIAZOLIDINYL UREA (FORMALDEHYDE RELEASER), DIAZOLIDYNL UREA, N-(HYDROXYMETHYL)-N-(1,3-DIHYDROXYMETHYL-2,5-DIOXO-4-IMIDAZOLIDINYL)-N'-(HYDROXYMETHYL) UREA, N-[1,3-BIS(HYDROXYMETHYL)-2,5-DIOXO-4-IMIDAZOLIDINYL-N,N'-BIS(HYDROXYMETHYL)- UREA, N-[1,3-BIS(HYDROXYMETHYL)-2,5-DIOXO-4-IMIDAZOLIDINYL]-N,N'-BIS(HYDROXYMETHYL) UREA, UREA, N-[1,3-BIS(HYDROXYMETHYL)-2,5-DIOXO-4-IMIDAZOLIDINYL-N,N'-BIS(HYDROXYMETHYL)-, and UREA, N[1,3BIS(HYDROXYMETHYL)2,5DIOXO4IMIDAZOLIDINYL]N,N BIS(HYDROXYMETHYL)
Restricted: EWG VERIFIED products cannot contain this ingredient without adequate substantiation
Diazolidinyl urea is an antimicrobial preservative that works by forming formaldehyde in cosmetic products. People exposed to such formaldehyde-releasing ingredients may develop a formaldehyde allergy or an allergy to the ingredient itself. 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
|styling gel/lotion||27 products|
|hair styling aide||27 products|
|hair treatment/serum||24 products|
|facial moisturizer/treatment||21 products|
|after sun product||12 products|
|hand cream||12 products|
|facial cleanser||11 products|
|body wash/cleanser||10 products|
|body firming lotion||8 products|
|foot moisturizer||8 products|
|body spray||7 products|
|styling mousse/foam||7 products|
|daily use with SPF||7 products|
|CC cream||5 products|
|serums & essences||4 products|
|makeup primer||4 products|
|facial powder||4 products|
|liquid hand soap||4 products|
|hair spray||4 products|
|shaving cream||3 products|
|recreational sunscreen||3 products|
|baby sunscreen||2 products|
|around-eye cream||2 products|
|after shave||2 products|
|BB cream||2 products|
|eye makeup remover||2 products|
|bubble bath||1 products|
|nail polish||1 products|
|damaged skin treatment||1 products|
|other eye makeup||1 products|
|setting powder/spray||1 products|
|hair color and bleaching||1 products|
|muscle/joint soreness||1 products|
|skin fading/lightener||1 products|
|Known human any toxicant or allergen||Open scientific literature|
|Human skin toxicant or allergen - strong evidence||EWG Assessment of Open Scientific Literature|
|Human skin toxicant or allergen - strong evidence||Cosmetic Ingredient Review Assessments|
|Human any toxicant or allergen - strong evidence||Open scientific literature|
|Limited evidence of immune system toxicity or allergies||National Library of Medicine HazMap|
|Cancer - limited evidence||Open scientific literature|
|Determined safe for use in cosmetics, subject to concentration or use limitations - any||Open scientific literature|
|Determined safe for use in cosmetics, subject to concentration or use limitations - Safe for use in cosmetics with some qualifications||Cosmetic Ingredient Review Assessments|
|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|
|58 studies in PubMed science library may include information on the toxicity of this chemical||NLM PubMed|
|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
- EWG Assessment of Open Scientific 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.
- 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.