Fragrance avoidance
No fragrance-linked caution surfaced in the current profile.
This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.
Di-tert-butyl peroxide
Di-tert-butyl peroxide is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.
Research docs0Claims0Sources6FunctionCatalyst • Chemical reaction regulatorIdentifier110-05-4
Concern score
100/100Critical concern driven by cmr.
Well researched
How we scored this
The concern value reflects this ingredient's chemical identity — its hazard profile from the published classifications and regulatory status below — not the safety of a product it appears in. A score near 40 is the baseline for ingredients with no specific signal (water scores 40 by design), so a mid-range value is not a safety verdict.
Concern score 100/100 (critical) · high confidence.
Regional restrictions
- EU — banned · Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Mutagenic Cat. 2()
Where it appears
Prevalence of Di-tert-butyl peroxide in our catalog (epa_cpdat).
Products
11
Brands
6
Raw materialsVehicle
Typical roles
CatalystChemical reaction regulatorHardener
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Good fit
Evidence read
The published evidence profile currently shaping this ingredient record.
No evidence profiles are attached to this ingredient yet.
Linked research
Primary documents currently linked to this ingredient record.
No linked research documents are attached to this ingredient yet.
Extracted claims
Structured claim signals pulled from linked ingredient research.
No extracted claims are attached to this ingredient yet.
Regulatory status
Published jurisdiction-level classifications and regulatory designations for this ingredient.
EU
EC
Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Mutagenic Cat. 2()
Effective: 2020-07-30View source →
US
EPA
EPA CPDat observed this chemical in 11 composition records across product categories including Raw materials, Vehicle. EPA CPDat classifies this chemical for functional uses including Hardener, Chemical reaction regulator, Catalyst.
Effective: January 7, 2008View source →
US
FDA