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Answer: Ensulizole is not currently banned worldwide, but health agencies have flagged concerns. The FDA still allows it in US cosmetics and personal-care products. Risk level: low. Commonly found in: Clinique City Block Purifying Charcoal Detox Moisturizer SPF 25, L'Oreal Paris UV Perfect Sunscreen, Neutrogena Clear Face Sunscreen SPF 30.
TL;DR: Ensulizole is allowed in the EU but allowed in the US (uv filters).
Reviewed for clarity & usefulness by the BannedPantry Parent Panel
INCI name PHENYLBENZIMIDAZOLE SULFONIC ACID. Also called PBSA. CAS 27503-81-7.
Other names: Phenylbenzimidazole Sulfonic Acid, PBSA, Eusolex 232
| 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 |
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.
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.
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.
For educational use only. This page summarizes the regulatory status of Ensulizolewith citations to the primary sources below. It is not medical advice. Regulatory status is not the same as a proven health effect — read the cited sources for their exact wording, and consult a doctor for decisions about your or your family's health.
Octisalate (octyl salicylate) as another water-compatible UVB-only filter.
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.
Yes. Its water solubility makes it particularly well-suited to lightweight, non-greasy formulations ideal for oily skin.
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