Science
Mechanism of Action
This organic filter specifically targets the UV-B spectrum with an absorption peak between 284-285 nm. It functions by intercepting high-energy ultraviolet radiation and converting it into lower-energy infrared radiation (heat), preventing the photons from inducing cellular damage in the skin.
Research
Clinical Evidence
High confidence6%
Key findings
- 01 Toxicological evaluations confirmed that concentrations up to 6% pose no health hazard and are non-mutagenic in both bacterial and mammalian cell models.
- 02 In vivo guinea pig models identified 5% as the maximum non-irritant threshold, showing no evidence of photo-sensitization.
- 03 Acute application tests of 30% aqueous solutions (Mexoryl SO) demonstrated minimal irritation potential on dermal tissue.
Transparency
Dusting Analysis
Because this ingredient contributes to a product's SPF rating, it is typically used at meaningful concentrations to meet regulatory sun protection claims. Formulations using it below 1% in sunscreens likely rely on it for product stability rather than active skin protection.
The Formula
Formulation
Stability
Exhibits superior photostability compared to many traditional filters. It is most stable in neutral to slightly acidic environments and is often handled as a 30% aqueous raw material.
Synergies
- Oil-soluble UV filters
- Antioxidants
- Cationic surfactants
Conflicts
- Anionic surfactants (SLS/SLES)
- Anionic thickeners (Carbomers, Acrylates)
- Strong oxidizing agents
Safety
Safety Profile
Authorized for use up to 6% in the EU and Australia. In the US, it is not currently an FDA-approved sunscreen active and is restricted to use as a UV absorber for formula protection.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A highly photostable water-soluble filter that provides reliable UV-B protection, though its compatibility with common thickeners requires precise formulation.
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References
Sources