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Ingredient register

Diazolidinyl Urea

Limit Skin irritant Cosmetics and personal care CAS 78491-02-8

Decode Label flags Diazolidinyl Urea as a moderate concern in cosmetics and personal care (skin irritant). It appears in 5 of the 912 published products we have analysed (0.5%).

The concern

Formaldehyde-releasing preservative - strong sensitiser

Diazolidinyl urea preserves by releasing formaldehyde, a known human carcinogen and strong skin sensitiser, and is more potent in this respect than imidazolidinyl urea. It is a recognised cause of allergic contact dermatitis.

Most relevant to

People with sensitive skin People with eczema Children

Cited authority

EU Regulation 1223/2009 Annex V; IARC Monograph 100F (formaldehyde)

Linked sources: EU-CosIng →

How common it is in this catalogue

Measured across every product Decode Label has analysed — not estimated, and not taken from anyone else's dataset.

5 of 912 published products 0.5%

By category

Haircare 4
Bath & Body 1

Regulatory position

From the published regulation itself. Each row links to its source.

Authority Status Reference Scope / limit Source
EU-CosIng Permitted Annex V 46 — max 0.5% View →

Identity

Canonical name
N-(Hydroxymethyl)-N-(dihydroxymethyl-1,3-dioxo-2,5-imidazolidinyl-4)-N'-(hydroxymethyl)urea
INCI name
DIAZOLIDINYL UREA
CAS number
78491-02-8
EC number
278-928-2

Also appears on labels as

Germall II

Questions

Is Diazolidinyl Urea safe?

The concern is cited to EU Regulation 1223/2009 Annex V; IARC Monograph 100F (formaldehyde). Why it is flagged: Formaldehyde-releasing preservative - strong sensitiser. Decode Label treats it as a moderate concern in cosmetics and personal care. It appears in 5 of the 912 published products we have analysed (0.5%).

How common is Diazolidinyl Urea in Indian packaged products?

Decode Label found Diazolidinyl Urea in 5 of 912 published products (0.5%), most often in Haircare, Bath & Body.

Is Diazolidinyl Urea restricted or banned anywhere?

Under the EU Cosmetics Regulation (EC) No 1223/2009 (CosIng), Diazolidinyl Urea has 1 permitted entry. Each is shown with its annex reference and a link to the source in the Regulatory position table.

Who should be most careful with Diazolidinyl Urea?

People with sensitive skin; People with eczema; Children.

Products containing Diazolidinyl Urea

5 published products, each with its own full analysis.

Kesh Kanti Anti Dandruff Hair Cleanser Kesh Kanti Milk Protein Kesh Kanti Reetha Hair Cleanser Kesh Kanti Shikakai Hair Cleanser Patanjali Herbal Hand Wash

Related ingredients

Other entries in the register with the same kind of concern.

Methylisothiazolinone Ammonium Lauryl Sulfate Benzisothiazolinone Bronopol CI 47000 Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde

Method and limits

  • Prevalence counts published products whose decoded ingredient list matches this substance or one of its label synonyms, using the same matching the score itself uses. It describes our catalogue of 912 products, not the Indian market as a whole.
  • Presence is not dose. An ingredient list gives order, not quantity, unless the pack declares a percentage. Nothing here estimates how much of this substance any product contains.
  • A classification is not a verdict on a product. An agency classifies a substance under defined conditions of exposure; whether that matters in a given food or cosmetic depends on route, concentration and use.
  • Last updated. This register entry was last changed on 3 November 2026.
  • Corrections. Every figure here is reproducible from the sources named. If something is wrong, tell us and we will correct it and say what changed.