PHENYLBENZIMIDAZOLE SULFONIC ACID
- Cosmetics Fine
What is PHENYLBENZIMIDAZOLE SULFONIC ACID?
Phenylbenzimidazole sulfonic acid, also called ensulizole, is a sunscreen filter that absorbs UVB rays, often used in light, water-based sunscreens. Very little passes through the skin, and safety tests are generally reassuring. It's fine for normal use; rare skin reactions, sometimes triggered by sunlight, have been reported.
What is Yasno’s verdict on PHENYLBENZIMIDAZOLE SULFONIC ACID?
Yasno’s verdict on PHENYLBENZIMIDAZOLE SULFONIC ACID: Fine. No meaningful concern at normal amounts.
Is PHENYLBENZIMIDAZOLE SULFONIC ACID allowed in the EU?
EU status of PHENYLBENZIMIDAZOLE SULFONIC ACID: Permitted as a UV filter in cosmetics (Annex VI of Regulation (EC) No 1223/2009). Conditions and limits come from the regulation cited below. Yasno summarises them and does not replace the legal text.
| Where | EU | US |
|---|---|---|
| Cosmetics | Permitted as a UV filter in cosmetics (Annex VI of Regulation (EC) No 1223/2009) | Not recorded |
Reference: Regulation (EC) No 1223/2009, Annex VI (entry 6) · Limit: 8%(as acid)
What else is it called?
- 2-Phenylbenzimidazole-5-sulphonic acid and its potassium, sodium and triethanolamine salts / Ensulizole
Sources
- Regulation (EC) No 1223/2009 on cosmetic products — Annex VI, European Union, 2009
- Safety review of seven active sunscreen ingredients, Australian Therapeutic Goods Administration, 2025
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