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2-TERT-BUTYL-P-CRESOL.

Optional CAS 2409-55-4 / PERFUMING

A synthetic phenolic antioxidant that serves as both a stabilizing agent for cosmetic formulations and a fragrance component. This compound works by neutralizing free radicals to prevent oxidative damage to oils, fats, and fragrance molecules in skincare products. While structurally similar to BHT, it offers targeted protection with moderate irritation potential.

antioxidant fragrance perfuming stabilizer

Science

Functions as a primary antioxidant by donating hydrogen atoms from its hydroxyl group to neutralize peroxy radicals, effectively breaking the chain reaction of lipid peroxidation and protecting formulation integrity


Research

Medium confidence
Effective range 0.02–0.5%
Optimal

0.02%

Key findings

  1. 01 IFRA guidelines recommend maximum 0.02% in fragrance concentrates for optimal stability with minimal sensitization risk
  2. 02 Patch testing of 11,454 patients showed only 0.096% positive reactions at 2.0% concentration, demonstrating low sensitizing potential

Transparency

Not commonly dusted
Min. effective
0.5%
Red flag below
0.5%

Concentrations above 0.5% may increase risk of chemical leukoderma and skin sensitization, making higher percentages potentially problematic


The Formula

Solubility
Oil
Optimal pH 4 – 7
0 7 14

Stability

Light-sensitive requiring dark storage containers; thermally stable but can volatilize with water vapor under certain conditions

Synergies

  • Other phenolic antioxidants
  • Fragrance compounds
  • Oil-based carriers

Conflicts

  • Acid chlorides
  • Acid anhydrides
  • Strong oxidizing agents
  • Brass
  • Copper alloys
  • Steel

Safety

CIR Status
Safe as used
Max tested
0.5%
Sensitization risk Low

CIR Expert Panel approval with concentration limits to prevent potential chemical leukoderma associated with phenolic compounds


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Moderate
Comedogenicity Unknown

Our Assessment

Optional

A functional antioxidant and fragrance component with proven safety but limited to specific applications due to moderate irritation potential.


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