Science
Mechanism of Action
Operating as a soluble organic broadband UV filter, Drometrizole Trisiloxane efficiently absorbs harmful UV-A (peaking at 344 nm) and UV-B (peaking at 303 nm) radiation. This absorbed energy is safely transformed into heat, forming an invisible, persistent protective layer in the skin's upper strata. Its inherent photostability ensures sustained efficacy without degradation under sun exposure. Furthermore, its antioxidant properties neutralize free radicals, offering protection against environmental pollution-induced oxidative stress.
Research
Clinical Evidence
High confidence15%
Key findings
- 01 The European Commission's Scientific Committee on Cosmetology (SCC) concluded that Drometrizole Trisiloxane, when used as a UV light absorber at a maximum concentration of 15%, poses no health hazard, demonstrating very low dermal absorption and no evidence of allergenicity or mutagenicity.
- 02 The U.S. FDA initiated a call for data in 2010 to evaluate Drometrizole Trisiloxane at concentrations up to 15% for potential inclusion in the OTC sunscreen monograph as a single active ingredient or in combination.
- 03 A single-dose dermal absorption study in mice using a 15% topical solution indicated systemic exposure, though at a minimal level.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Drometrizole Trisiloxane is characterized by its exceptional photostability, maintaining efficacy when exposed to sunlight. Its distinct siloxane structure facilitates excellent formula compatibility and imparts water resistance, ideal for water-resistant sunscreen formulations. As a silicone-based ingredient, it also enhances product texture and spreadability. It is frequently co-formulated with other UV filters such as ecamsule, titanium dioxide, and avobenzone to achieve broader spectrum UV protection and synergistic benefits.
Synergies
- Ecamsule
- Titanium Dioxide
- Avobenzone
Safety
Safety Profile
In Europe, Drometrizole Trisiloxane is approved as a UV filter in cosmetic products at a maximum concentration of 15% by the SCCS (formerly SCC), confirming no health hazard, very low dermal absorption, and no evidence of allergenicity or mutagenicity. In the United States, it is not yet recognized by the FDA as Generally Recognized as Safe and Effective (GRASE) for OTC sunscreen use, primarily due to ongoing data review for its potential inclusion in the OTC monograph at concentrations up to 15%. It is generally considered non-irritating, well-tolerated, and hypoallergenic, with minimal skin absorption. However, rare instances of allergic contact dermatitis have been documented.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Drometrizole Trisiloxane is a valuable broadband, photostable UV filter, offering robust sun protection and antioxidant benefits, with a strong safety profile in Europe and promising regulatory review in the US.
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References
Sources