Ensulizole

Phenylbenzimidazole Sulfonic Acid

Filters UV light.

In the Chemical UV filters group

What it is

A UV filter made in a lab that dissolves in water. One of the chemical UV filters.

A UV filter that absorbs certain UV rays, mainly UVB, and it also helps protect the product itself from light.

A short summary from the dictionary, not yet an in-depth article. About these entries

What it does in a formula

Filters UV lightOfficial EU function: UV filter

Shields the formula from lightOfficial EU function: UV absorber

Why some people watch for it

Chemical UV filters

Some people prefer mineral sunscreens and avoid organic filters, for example because of sensitive skin or eyes or a preference for mineral-only formulas.

A group is a fact about the ingredient, not a judgement of it.

What official sources say

Restricted in certain uses · Cosmetics, EU

Allowed as a UV filter in EU cosmetics up to 8% (Annex VI).

Regulation (EC) No 1223/2009, Annex VI: list of UV filters allowed in cosmetic products (CosIng), retrieved 2026-10-09

A label gives no amounts, so none of this says a product is unsafe.