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Annex II Entry 321 CMR11/02/2011

Thiourea and its derivatives, with the exception of the one listed in Annex III

Thiourea and its derivatives, with the exception of the one listed in Annex III is listed in Annex II as a prohibited substance for cosmetic products placed on the EU market.

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Prohibited substance— Annex II, EU Regulation 1223/2009
Entry: 321
CMR

Chemical identity and properties

PubChem 2D chemical structure for CAS 62-56-6
CAS 62-56-6PubChem CID 2723790

Thiourea

Thiourea is the simplest member of the thiourea class, consisting of urea with the oxygen atom substituted by sulfur. It has a role as an antioxidant and a chromophore. It is a member of ureas, a member of thioureas and a one-carbon compound. It is functionally related to a urea and a carbonothioic O,O-acid. — ChEBI

IUPAC name
thiourea
Molecular formula
CH4N2S
Molecular weight
76.12 g/mol
Exact mass
76.00951931 Da
XLogP3
-0.8
Topological polar surface area
84.1 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

ThiocarbamideIsothioureaSulfourea2-ThioureaPseudothioureaThiuroniumSulourea2-Thiopseudourea
16 more reported names
Thiocarbonic acid diamideUrea, thio-beta-ThiopseudoureaThiomocovinaUrea, 2-thio-Tsizp 34Pseudourea, 2-thio-ThiocarbamidThioharnstoffThiokarbamidUSAF EK-497carbonothioic diamideRCRA waste number U219CCRIS 588GYV9AM2QAGH2NC(S)NH2
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Chemical name

Thiourea and its derivatives, with the exception of the one listed in Annex III

Regulatory information

Regulation

(EC) 2009/1223

See every entry this act set

Identified ingredients

  • 1,3-Bis(hydroxymethyl)-3-thiourea
  • Hydroxymethyl-2-thiourea
  • 1-Hydroxymethylimidazolidine-2-thione
  • 1-Monomorpholinomethyl-2-thiourea
  • 1,3-Bis(morpholinomethyl)-2-thiourea
  • THIOUREA

CMR

CategoryCarcinogenicMutagenicReprotoxic
Cat. 2✓—✓

Key data

CAS
62-56-6
EC
200-543-5
Annex
II
Entry number
321

Inventory links for Thiourea and its derivatives, with the exception of the one listed in Annex III

Inventory Restriction reference
Ref 88079

THIOUREA

CAS: 62-56-6
EC: 200-543-5

Direct matches are limited for this record, so nearby entries from Annex II are shown as well.

What Annex II means for Thiourea and its derivatives, with the exception of the one listed in Annex III

Thiourea and its derivatives, with the exception of the one listed in Annex III is listed as a prohibited substance under Annex II of EU Cosmetics Regulation 1223/2009 and must not be intentionally added. Article 17 separately addresses unintended small quantities that are technically unavoidable under good manufacturing practice and compatible with the Article 3 safety requirement.

Formulators must screen their ingredients and raw materials to ensure none contain this substance. Suppliers should provide documentation confirming absence when requested.

This record is linked to 1 CosIng inventory ingredient for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Verify this substance is absent from all raw materials and finished formulations.
  • Request absence confirmation or CoA from raw material suppliers.
  • Document the screening result in the Product Information File (PIF).
  • This substance has CMR classification. Review the CMR table above and verify current Annex II/III status before use.

Frequently asked questions

Yes. Thiourea and its derivatives, with the exception of the one listed in Annex III is listed in Annex II of EU Cosmetics Regulation 1223/2009 and is prohibited as an intentionally added cosmetic ingredient. Article 17 provides a narrow exception for unintended small quantities that are technically unavoidable under good manufacturing practice, provided the product remains safe under Article 3.

CAS 62-56-6 is the unique numerical identifier assigned to Thiourea and its derivatives, with the exception of the one listed in Annex III by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

Thiourea and its derivatives, with the exception of the one listed in Annex III has a CMR (carcinogenic, mutagenic or reprotoxic) classification under EU CLP Regulation. Under Article 15 of EU Cosmetics Regulation 1223/2009, CMR substances of category 1A or 1B are prohibited in cosmetics unless specifically permitted. Category 2 CMR substances may be used only if assessed safe by the SCCS. Always verify current annex status and any applicable derogations before use.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
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Source note for Annex II record Thiourea and its derivatives, with the exception of the one listed in Annex III

This page summarizes one Annex II record for Thiourea and its derivatives, with the exception of the one listed in Annex III from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex II conditions for Thiourea and its derivatives, with the exception of the one listed in Annex III, but confirm any final regulatory decision against the current official annex wording and source files.

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