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.
About
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
Check your shelf
Find 3-Imidazol-4-ylacrylic acid (Urocanic acid) and its ethyl ester in your products.
Scan any cosmetic product with LuxSense to see if it contains 3-Imidazol-4-ylacrylic acid (Urocanic acid) and its ethyl ester and get a full ingredient breakdown with safety scores.
This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.