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Moumoujus

BUMETRIZOLE.

Valuable CAS 3896-11-5 / UV ABSORBER

A specialized phenolic benzotriazole compound that functions as a photostabilizer, primarily protecting UV-sensitive ingredients from degradation rather than providing direct sun protection to skin. This oil-soluble ingredient works behind the scenes to maintain formula integrity by converting harmful UV radiation into harmless heat through molecular energy transfer.

Summary

uv absorber photostabilizer

Science

Mechanism of Action

Operates through excited-state intramolecular proton transfer (ESIPT), absorbing UV radiation in the 280-350 nm range and converting this energy into non-destructive heat via internal hydrogen bonding, thereby preventing photochemical breakdown of sensitive formula components.

Research

Clinical Evidence

Medium confidence
Effective range 0.1–1%
Optimal

0.5%

Key findings

  1. 01 Enhanced photostability of tretinoin formulations while reducing UV-induced skin damage markers in laboratory models

Transparency

Dusting Analysis

Not commonly dusted

As a specialized photostabilizer rather than a primary active ingredient, dusting is not a relevant concern for bumetrizole

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Demonstrates exceptional thermal and photochemical stability as a pale yellow crystalline powder, maintaining integrity across varied processing conditions without light-induced decomposition

Synergies

  • tretinoin
  • light-sensitive actives
  • fragrance compounds

Conflicts

  • highly polar aqueous systems

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1%
Sensitization risk Low

Demonstrates low acute toxicity and minimal skin/eye irritation at typical use concentrations. EU classification as SVHC relates to environmental persistence rather than human safety concerns.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

A highly effective photostabilizer that enhances formula longevity and protects sensitive ingredients, particularly valuable in formulations containing light-unstable actives.

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References

Sources