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4-T-BUTYLBENZOIC ACID.

Avoid CAS 98-73-7 / FRAGRANCE, PERFUMING

A crystalline aromatic acid primarily utilized as a chemical intermediate in UV filter synthesis, most notably for Avobenzone production. This compound occasionally appears as an unintentional residual impurity in cosmetic formulations, where it may exhibit masking and antimicrobial properties but poses significant safety concerns.

masking antimicrobial

Science

Functions primarily as a building block for UV filter synthesis rather than a direct skin-active ingredient. When present in cosmetic contexts, it may provide masking effects to neutralize unwanted odors and demonstrate antimicrobial activity, though these are secondary to its main industrial applications.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted
Red flag below
0.01%

Any presence above trace levels is concerning due to EU prohibition and fertility safety risks


The Formula

Solubility
Oil
Optimal pH 2.5 – 9
0 7 14

Stability

Demonstrates high stability as an aromatic acid compound, forming white to off-white crystalline structures with naturally acidic pH around 3.9 in saturated solutions

Conflicts

  • Oxidizing materials
  • Strong alkaline compounds

Safety

CIR Status
Not reviewed
Max tested
0%
Pregnancy
Caution
Sensitization risk High

Classified as CMR substance with H360F designation for potential fertility damage. Completely prohibited in EU cosmetics under Annex II, Entry 1549.


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Avoid

Prohibited ingredient with serious fertility safety concerns that should never appear in cosmetic formulations.


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