Disodium Phenyl Dibenzimidazole Tetrasulfonate (also known as bisdisulizole disodium or Neo Heliopan AP) is a water-soluble organic UV filter that absorbs primarily in the UVA range, used in sunscreens and daytime skincare to enhance photoprotection. Because it is hydrophilic, it remains in the aqueous phase of formulations and is generally non-penetrating.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation | Rare | Mild stinging or redness occasionally reported, more likely on sensitive or compromised skin. |
Allergic contact dermatitis | Very rare | Isolated case reports; photoallergic reactions are uncommon for this filter. |
Eye irritation | Uncommon | Possible if product migrates into the eyes, due to its water-soluble nature. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.