Neo Heliopan Hydro (INCI: Phenylbenzimidazole Sulfonic Acid) is a water-soluble organic UVB filter used in sunscreens and daily-care products to protect against UVB-induced skin damage. It is effective in the UVB range and is often combined with other filters for broad-spectrum protection.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation or stinging | Uncommon | Mild transient irritation, more likely on sensitive or compromised skin. |
| Contact dermatitis (allergic) | Rare | Occasional sensitization reported in patch-test studies. |
| Photoallergic or photocontact reaction | Rare | Reactions triggered or worsened by sun exposure documented in case reports. |
| Eye irritation | Uncommon | Can sting on contact with eyes given its acidic, water-soluble nature. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.