Urocanic Acid
molecular structure · PubChem
AKA: 104-98-3, Urocaninic acid, 3-(1H-Imidazol-4-yl)-2-propenoic acid, (2E)-3-(1H-imidazol-4-yl)prop-2-enoic acid, 2-Propenoic acid, CHEBI:27248
Synthetic
Sunscreen Filter
Amino Acid
Acid
Not Clean
2-Propenoic acid, 3-(1H-imidazol-4-yl)-
Solubility 1500
Formula
C6H6N2O2
Mol. Weight
138.12
CAS #
104-98-3
Form
Liquid
State
Solid
Functions
Uv Absorber
Blocks or absorbs UV rays to protect your skin from sun damage, dark spots, and premature aging.
Shields from UV damage
Traditional Use
A naturally occurring compound in human skin discovered in the early 20th century. Found to regulate skin pH and provide UV protection; later synthesized and incorporated into modern skincare formulations.
Skin Types
●all-skin-types
Best For
Sun Damage
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR