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Moumoujus

4-ISOBUTYLRESORCINOL.

Essential CAS 18979-62-9 / ANTIOXIDANT

A highly potent tyrosinase inhibitor that outperforms traditional brightening agents like hydroquinone and kojic acid in clinical testing. This advanced resorcinol derivative targets melanin production at the enzymatic level, delivering measurable improvements in hyperpigmentation with lower irritation potential.

Summary

skin brightening antioxidant

Science

Mechanism of Action

Functions as a competitive inhibitor of tyrosinase and tyrosinase-related protein-1 (TRP-1), blocking the enzymatic conversion of L-tyrosine to L-DOPA and subsequent melanin synthesis without damaging melanocyte cells

Research

Clinical Evidence

High confidence
Effective range 0.1–0.3%
Optimal

0.1%

Key findings

  1. 01 0.3% concentration showed 84% effectiveness in melasma treatment over 24 weeks (International Journal of Dermatology)
  2. 02 0.1% cream demonstrated significant Melanin Index reduction in randomized split-face trial (Annals of Dermatology)
  3. 03 Superior tyrosinase inhibition compared to hydroquinone, arbutin, and kojic acid at 0.1-0.3% (Journal of Drugs in Dermatology)

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0.05%
Red flag below
0.01%

Given its high potency and effective clinical range starting at 0.1%, concentrations below 0.05% are likely insufficient for meaningful brightening benefits

The Formula

Formulation

Solubility
Oil
Optimal pH 4.5 – 6
0 7 14

Stability

Extremely light and oxidation sensitive, requiring opaque airless packaging. Nanoemulsion or encapsulation often necessary for stability and enhanced penetration.

Synergies

  • Niacinamide
  • Vitamin C (in separate applications)
  • Gentle AHAs

Conflicts

  • Strong oxidizing agents
  • Highly alkaline ingredients
  • Direct UV exposure

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1%
Sensitization risk Low

Generally well-tolerated with lower irritation potential than related compounds. Professional treatments may use up to 1.0%, while OTC formulations typically stay at 0.3% or below.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Essential

A clinically-proven, next-generation brightening agent that delivers superior results with excellent tolerability across all skin types.

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References

Sources