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ISOBUTYLAMIDO THIAZOLYL RESORCINOL.

Valuable CAS 1428450-95-6 / BLEACHING

Isobutylamido Thiazolyl Resorcinol, also known as Thiamidol, is a highly effective precision ingredient recognized for its robust action against hyperpigmentation. It directly targets the enzymatic pathway of melanin production, visibly diminishing dark spots and improving overall skin tone.

Summary

skin brightening bleaching skin conditioning - miscellaneous

Science

Mechanism of Action

This active functions as a potent and specific inhibitor of human tyrosinase, the primary enzyme responsible for melanin synthesis within the skin. By reversibly blocking tyrosinase activity, Isobutylamido Thiazolyl Resorcinol significantly reduces the formation of melanin, leading to a visible reduction in existing dark spots and prevention of new hyperpigmentation.

Research

Clinical Evidence

High confidence
Effective range 0.1–0.2%
Optimal

0.2%

Key findings

  1. 01 Clinical application of 0.2% concentration demonstrated significant reduction in facial hyperpigmentation within 4 weeks, with improvements sustained over 12 weeks of daily use.
  2. 02 At 0.2%, it showed comparable efficacy to 4% hydroquinone cream in improving melasma severity, with a favorable mild adverse effect profile.
  3. 03 Studies using 0.15% concentration, both alone and in conjunction with hyaluronic acid, successfully reduced melasma severity over a 12-week period.
  4. 04 Topical application prevented UVB-induced hyperpigmentation within 3 weeks, suggesting strong prophylactic capabilities.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

This ingredient is oil-soluble and can be dissolved in various solvents including DMSO, PEG300, Tween-80, Saline, SBE-β-CD in Saline, and Corn oil. Should precipitation or phase separation occur during preparation, gentle heating or sonication can aid in dissolution. It is amenable to formulation within oil-in-water emulsions.

Synergies

  • Hyaluronic acid (observed to enhance efficacy in reducing melasma severity)

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0.2%
Sensitization risk Low

Identified by the FDA UNII code OH3UOW0EHH, this is a publicly validated substance. Clinical studies consistently report only mild adverse effects. Patch testing at 0.2% indicated safety without causing irritation or active sensitization, although the potential for an allergic reaction cannot be entirely excluded. It is generally considered a safe and effective cosmetic ingredient, particularly for addressing post-inflammatory hyperpigmentation. No specific CIR or SCCS review status is currently available.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Isobutylamido Thiazolyl Resorcinol is a valuable ingredient for precision skincare, demonstrating high efficacy in reducing and preventing hyperpigmentation across various skin types with a favorable safety profile.

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