Moderate Cosmetic Ingredient SCCS/CIR Reviewed Sensitization Data

THIMEROSAL

CAS Number
54-64-8
Function
Preservative
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status Restricted
EU Max Conc. V/16
๐Ÿ‡บ๐Ÿ‡ธ US Status Not specifically regulated

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Opinions

Official safety assessments from the Scientific Committee on Consumer Safety (SCCS) and Cosmetic Ingredient Review (CIR).

sccs SCCS/1686/25 2 February 2026
Verdict: unknown
Max Concentration: 0.007% in eye area

Sensitization Profile

Contact sensitization data for THIMEROSAL based on clinical patch test studies and IFRA standards.

Sensitization Rate
high
Allergen Class
preservative
EU Allergen Listed
no
Patch Test Positive Rate
5.0%
Cross-reactivity Group
mercury-group
Reaction Type
contact-dermatitis

Source: ESSCA; IVDK; NACDG

Expert Verdict

THIMEROSAL is listed in the EU CosIng database with functions: Preservative It is restricted under EU Cosmetics Regulation. Restriction: V/16.

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Concern Level: Medium

Regulatory Flags

cosing-sourced eu-restricted preservative needs-enrichment eu_cosing_listed

Frequently Asked Questions

Is THIMEROSAL safe in cosmetics?

THIMEROSAL is listed in the EU CosIng database with functions: Preservative It is restricted under EU Cosmetics Regulation. Restriction: V/16. The EU classifies THIMEROSAL as "Restricted". Safety rating: MODERATE. This ingredient has been reviewed by sccs.

Is THIMEROSAL allowed in the EU?

THIMEROSAL EU regulatory status: Restricted. Maximum allowed concentration: V/16. This is based on EU Regulation 1223/2009 and its amendments.

What does THIMEROSAL do in cosmetics?

THIMEROSAL functions as: Preservative. It is classified as a cosmetic ingredient in our database. CAS number: 54-64-8.

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