UV Filter
3-Imidazol-4-ylacrylic acid (Urocanic acid) and its ethyl ester
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
Urocanic acid (and its ethyl ester) — a UV-absorbing molecule historically used in sunscreens, now restricted/prohibited in EU due to photoallergenic and immunosuppressive effects upon UV conversion to cis-isomer.
Skin benefits
- UV-absorbing capacity historically used in sunscreens
Known concerns
- Documented photoallergen
- Suspected immunosuppressive on UV exposure
- EU Annex II prohibition for direct cosmetic use
- Photoreactivity converts trans- to cis- form linked to immune effects
- No longer approved as UV filter in EU/most regions
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related uv filters
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.