Science
Mechanism of Action
This ingredient functions by absorbing UV light, both UVA and UVB wavelengths, and converting this absorbed energy into harmless heat through a reversible molecular rearrangement process. On the skin, it helps mitigate damage from sun exposure, acting as an SPF booster. Within cosmetic formulas, it safeguards sensitive components like pigments, fragrances, and active antioxidants from light-induced breakdown, thereby preserving product efficacy and appearance.
Research
Clinical Evidence
Medium confidenceN/A
Transparency
Dusting Analysis
This ingredient is utilized as a UV filter and light stabilizer rather than an active requiring specific dusting considerations for efficacy or irritation at varying concentrations.
The Formula
Formulation
Stability
Exhibits hydrolytic stability at 50°C. Its manufacturing process involves pH adjustment to 7, suggesting robust stability around neutral pH. It plays a critical role in preventing product discoloration, deterioration, and loss of active ingredient efficacy by protecting against UV light.
Synergies
- Light-sensitive cosmetic ingredients (e.g., certain pigments, fragrances, antioxidants)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Sodium Benzotriazolyl Butylphenol Sulfonate is safe in cosmetics at current use concentrations. It was found to be non-irritating to rabbit skin at 100%, though a 4% concentration induced temporary erythema in a rat study that resolved by day 8. It did not cause dermal sensitization in studies up to 30% w/v. However, it is an ocular irritant, causing irreversible corneal damage at 30% and 100% in rabbit studies. It functions as an SPF booster and light stabilizer but is not an FDA-approved UV filter for direct sunscreen claims.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This ingredient is valuable for precision skincare, providing essential UV protection for the skin and critical photostability for cosmetic formulations, thereby preserving both product integrity and dermal health.
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