Is Ensulizole Banned? EU vs US Status, Risks & Where It Hides
TL;DR: Ensulizole is allowed in the EU but allowed in the US (uv filters).
INCI name PHENYLBENZIMIDAZOLE SULFONIC ACID. Also called PBSA. CAS 27503-81-7.
Other names: Phenylbenzimidazole Sulfonic Acid, PBSA, Eusolex 232
Is Ensulizole banned in the EU?
| EU status | Allowed |
|---|---|
| US status | Allowed |
| Risk level | low |
| Where it shows up | Clinique City Block Purifying Charcoal Detox Moisturizer SPF 25, L'Oreal Paris UV Perfect Sunscreen, Neutrogena Clear Face Sunscreen SPF 30 |
| CAS number | 27503-81-7 |
What is Ensulizole?
Ensulizole (INCI: Phenylbenzimidazole Sulfonic Acid) is a water-soluble UVB-absorbing chemical sunscreen active. Because it is water-based, it provides a lighter, less oily feel compared to oil-soluble UV filters.
Why is Ensulizole used in personal-care products?
Used in lightweight UVB-protective formulas, often as part of a two-filter broad-spectrum system (combined with a UVA filter like avobenzone). Popular in facial moisturizers with SPF due to its non-greasy texture.
Is Ensulizole dangerous? Documented risks
Ensulizole is approved by the FDA at up to 4% and in the EU at up to 8%. It is water-soluble and less likely to cause sensitivity reactions than oil-soluble filters. Minimal systemic absorption is documented. No established carcinogenicity or endocrine disruption. As with other UV filters, phototoxicity and photocontact dermatitis are very rare possibilities.
Products that may contain Ensulizole
- Clinique City Block Purifying Charcoal Detox Moisturizer SPF 25
- L'Oreal Paris UV Perfect Sunscreen
- Neutrogena Clear Face Sunscreen SPF 30
How to avoid Ensulizole: safer alternatives
Octisalate (octyl salicylate) as another water-compatible UVB-only filter.
Frequently asked questions about Ensulizole
What does ensulizole protect against?
UVB rays (280–320 nm) only. For complete broad-spectrum protection, ensulizole must be combined with a UVA filter such as avobenzone or zinc oxide.
Is ensulizole safe for oily skin?
Yes. Its water solubility makes it particularly well-suited to lightweight, non-greasy formulations ideal for oily skin.
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Sources
- FDA Sunscreen Monograph — Active Ingredient List — U.S. Food and Drug Administration
- EWG Skin Deep: Ensulizole — Environmental Working Group
Our scores are never influenced by brands. Last updated 6/11/2026.