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4-HYDROXYBENZOIC ACID.

Valuable CAS 99-96-7 / FRAGRANCE, PRESERVATIVE

A multifunctional preservative compound that serves as the parent structure for paraben esters, offering antimicrobial protection while demonstrating emerging potential as a tyrosinase inhibitor for pigmentation concerns. Beyond preservation, this phenolic compound provides mild antioxidant benefits through its aromatic structure and shows promise in disrupting bacterial membrane transport processes.

preservative antimicrobial antioxidant tyrosinase inhibitor

Science

Functions by disrupting bacterial and fungal membrane transport systems while inhibiting key mitochondrial enzymes essential for microbial growth. The phenolic hydroxyl group enables tyrosinase enzyme inhibition, potentially interfering with melanin synthesis pathways, while the aromatic structure contributes antioxidant activity through free radical neutralization.


Research

High confidence
Effective range 0.14–0.8%
Optimal

0.4%

Key findings

  1. 01 SCCS regulation establishes 0.14% maximum for specific paraben esters in individual use
  2. 02 CIR and EU guidelines confirm 0.8% maximum for paraben mixtures in finished products

Transparency

Not commonly dusted

Regulatory oversight with established concentration limits prevents dusting practices


The Formula

Solubility
Both
Optimal pH 3 – 6.5
0 7 14

Stability

Limited water solubility at 5-6g/L increases significantly in organic solvents and at elevated pH where deprotonation forms water-soluble benzoate salts

Conflicts

  • Strong oxidizing agents
  • Strong bases
  • Reducing agents
  • Non-ionic surfactants (reduce antimicrobial efficacy via micellar sequestration)

Safety

CIR Status
Safe as used
Max tested
0.8%
Pregnancy
Safe
Sensitization risk Low

Avoid leave-on applications in diaper area for children under 3 years due to potential barrier disruption and enhanced absorption


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

A well-regulated preservative with emerging antipigmentation potential, suitable for most skin types except sensitive conditions.


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References