What it is
Ensulizole, also known as Phenylbenzimidazole Sulfonic Acid, is a whitish beige powder.
What it does
Ensulizole is a sunscreen agent that provides mainly UVB and only minimal UVA protection. That’s why, to offer broad-screen protection, Ensulizole needs to be used in products together with ingredients that protect from UVA rays like Titanium Dioxide, Zinc Oxide, Mexoryl SX, Avobenzone and Tinosorb.
Although there aren’t many studies on the stability of Ensulizole when exposed to sunlight, it doesn’t seem to degrade much and may also partly prevent other sunscreen agents from degradation.
Ensulizole is water-soluble, so it feels light and not greasy on skin.
Ensulizole is safe to use in cosmetics at a maximum concentration of 8%.
Inflammation of the skin can occur, but it’s rare.