Terephthalylidene Dicamphor Sulfonic Acid (also known as ecamsule or Mexoryl SX) is a water-soluble organic UVA filter used in sunscreens to provide broad protection against UVA rays. It is photostable and often combined with other filters to enhance coverage.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation (mild stinging or redness) | Uncommon | Transient and typically mild, especially on sensitive skin. |
Allergic contact dermatitis | Rare | Reported in isolated cases; confirmed via patch testing. |
Eye irritation | Uncommon | Can occur if product migrates into the eyes. |
Photoallergic reaction | Very rare | Rarely documented compared with some other UV filters. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.