Terephthalylidene Dicamphorsulfonic Acid (Ecamsule, Mexoryl SX) is a water-soluble organic UV filter that absorbs primarily in the UVA range (around 290-390 nm, peak ~345 nm), used in sunscreens to provide broad-spectrum photoprotection. It is photostable and often combined with other filters to enhance UVA coverage.
| Reported effect | How often | Notes |
|---|---|---|
| Contact dermatitis / skin irritation | Rare | Occasional reports of irritant or allergic contact reactions in sensitive individuals. |
| Allergic contact sensitization | Very rare | Photoallergic or allergic reactions documented in isolated case reports. |
| Eye stinging or irritation | Uncommon | Can cause transient stinging if the product migrates into the eyes. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.