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* A water-soluble absorber of ultraviolet B radiation, used topically as a sunscreen

* Also known as phenylbenzimidazole sulfonic


Ensuliozole is a UVB-protecting agent found in most sunscreens. It does protect skin from UVA rays as well, but not as thoroughly as the protection provided from UVB rays. For complete skin protection, this ingredient (as well as many other UVB-protecting sunscreen ingredients) must be paired with other UVA-protecting ingredients (including avobenzone, titanium dioxide, zinc oxide, or Mexoryl SX), according to

Most chemical sunscreen ingredients are oils that are soluble in the oil phase of emulsion systems (eMedicine). Because ensulizole is water-soluble, it has the unique characteristic of feeling lighter on skin. As such, it is often used in sunscreen lotions or moisturizers with a goal of a non-greasy finish.

Safety Measures/Side Effects:

Although there are no negative side effects of ensulizole, it is important that sunscreen contains additional ingredients that protect against UVA rays as well.

Recommended Product w/ Ensulizole:

Kiehl’s Facial Fuel SPF 15 Sunscreen Moisturizer

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