Phenylbenzimidazole Sulfonic Acid (Ensulizole) is a water-soluble organic UV filter that primarily absorbs UVB radiation, helping to prevent sunburn. Its water solubility makes it suitable for lighter, less greasy sunscreen and daily moisturizer formulations.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation | Uncommon | Mild stinging or redness, especially on sensitive or compromised skin. |
Allergic contact dermatitis | Rare | Sensitization reactions reported in patch-test studies. |
Photoallergic/photocontact reactions | Rare | Reaction triggered upon UV exposure; documented occasionally. |
Eye irritation | Uncommon | Can sting if product migrates into the eyes. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.