Why does CAS 67-68-5 appear in more than one EU cosmetic annex?

A substance identified by CAS 67-68-5 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts — for example, restricted under Annex III with specific conditions, while also appearing in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

How do I check if my formula contains a substance with CAS 67-68-5?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 67-68-5 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 67-68-5

Q: How do I use CAS 67-68-5 for compliance screening?

Cross-reference CAS 67-68-5 against your raw material specification sheets and CoA documents. When it appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met. All annex entries sharing this CAS number are listed on this page.

CAS 67-68-5 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 67-68-5

CAS 67-68-5PubChem CID 679

Dimethyl Sulfoxide

Dimethyl sulfoxide is a 2-carbon sulfoxide in which the sulfur atom has two methyl substituents. It has a role as a geroprotector, an alkylating agent, a non-narcotic analgesic, a MRI contrast agent, a polar aprotic solvent, a radical scavenger, an antidote and an Escherichia coli metabolite. It is a volatile organic compound and a sulfoxide. — ChEBI

IUPAC name: methylsulfinylmethane

Molecular formula: C2H6OS
Molecular weight: 78.14 g/mol
Exact mass: 78.01393598 Da
XLogP3: -0.6
Topological polar surface area: 36.3 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

DMSOMethyl sulfoxideDimethyl sulphoxideDimethylsulfoxidesulfinylbismethaneDemasorbDomosoMethane, sulfinylbis-

16 more reported names

DemsodroxDromisolDeltanDemavetDemesoDolicurHyadurInfiltrinaSomiprontDimexideDurasorbSyntexanDermasorbDimethyl sulfur oxideDoligurDipirartril-tropico

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:28262
ChEMBL:CHEMBL504
EPA DTXSID:DTXSID2021735
PubMed:29968805
PubMed:24103309
PubMed:23125815
PubMed:23125587
PubMed:23124456
PubMed:23123479
PubMed:23119145
PubMed:23116023
PubMed:23114616
PubMed:23109876
PubMed:23108618
PubMed:23106887

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

Records for CAS 67-68-5

1 total

Annex

Entry

338

Dimethyl sulfoxide (INN)

200-664-3

How CAS 67-68-5 is used on this site

CAS 67-68-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 67-68-5 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.

Frequently asked questions

A substance identified by CAS 67-68-5 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts. For example, a substance might be restricted under Annex III with specific conditions, and the same CAS might also appear in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

Cross-reference the CAS number against your raw material specification sheets and CoA documents. When a CAS appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met in your formulation. All annex entries sharing this CAS number are listed above.

A CAS number is assigned by the Chemical Abstracts Service (USA) and is globally recognised. An EC number is a European Commission identifier from inventories such as EINECS, ELINCS or the NLP list. Both identifiers may appear in EU cosmetic annex entries. Some substances have both, some have only one, and some older entries may have neither.

The INCI Checker accepts ingredient names, CAS numbers and EC numbers. Check this CAS number directly, then verify the result against supplier specification sheets and every linked annex condition.

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Tools & next steps

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