Fragrance avoidance
Not a strong fit for fragrance avoidance because it carries Fragrance.
The ingredient itself is a fragrance-linked signal, so it is better treated as an avoid case when fragrance exposure is the main concern.
4-tert-Butylcatechol
4-tert-Butylpyrocatechol is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.
Research docs0Claims0Sources6FunctionFragrance • polymerization initiators / inhibitors / catalysts>inhibitorsIdentifier98-29-3
Concern score
100/100Critical concern based on regulatory listings.
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.
Where it appears
Prevalence of 4-tert-Butylcatechol in our catalog (epa_cpdat).
Products
11
Brands
5
Laboratory suppliesSpecialty occupational productsRaw materials
Typical roles
Fragrancepolymerization initiators / inhibitors / catalysts>inhibitors
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Avoid
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.
Effective: 2010-10-15View source →
US
EPA
EPA CPDat observed this chemical in 11 composition records across product categories including Laboratory supplies, Specialty occupational products, Raw materials. EPA CPDat classifies this chemical for functional uses including Fragrance, polymerization initiators / inhibitors / catalysts>inhibitors.
Effective: 2020-03-19View source →
US
FDA