This ingredient could revolutionize your sunscreen: focus on Ensulizole
Organic filters are often accused of making textures heavy or leaving a greasy film. However, a little-known compound is changing the game: Ensulizole (Phenylbenzimidazole Sulfonic Acid). Water-soluble, lightweight, and photostable, it offers a modern solution for lightweight, effective sun protection, suitable for extreme conditions and outdoor sports.
1. Nature and primary role
Ensulizole belongs to the family of sulfonated benzimidazoles. Its key advantage: high solubility in water, which allows for ultra-light emulsions and non-greasy mists suitable for combination to oily skin.
2. Why does it appeal to formulators?
- Imperceptible touch : the absence of an oily phase reduces the white effect and limits stickiness.
- Generous regulatory concentration : up to 8 % in the European Union.
- Stabilizing effect : its presence protects less photostable UVA filters, extending the overall performance of the product.
3. Spectrum of action: UVB specialist
Between 290 and 320 nm, Ensulizole absorbs UVB energy and dissipates it in the form of harmless heat. It therefore protects against sunburn and some DNA damage. However, its effectiveness drops below 340 nm, so it must be combined with a broad-spectrum filter to counteract premature aging caused by UVA rays.
4. Photostability and synergies
Recent studies show that an Ensulizole-β-cyclodextrin complex further improves resistance to radiation while strengthening the protective film. This characteristic makes it compatible with high-performance formulas for outdoor sports or tropical climates.
5. Skin and environmental safety profilee
Toxicological data point to a very low risk:
- No irritation or sensitization, with a concentration within regulatory limits; ;
- Low percutaneous absorption: less than 0.3% of the applied dose; ;
- No mutagenic or endocrine activity has been identified to date; ;
- Ecological vigilance: low toxicity and moderate bioaccumulation, but monitoring remains active to assess long-term consequences.
6. Practical usage sheet
- Preferred dosage forms : light emulsions, gels, aqueous sprays.
- Recommended synergies : titanium dioxide, zinc oxide, or organic UVA filters for full spectrum protection.
- Conservation : dry environment, < 86 °F, protected from light to preserve stability.
- Target skin type : all skin types, with particular benefits for oily skin types or those prone to acne.
