Phenylbenzimidazole Sulfonic Acid
INCI · Phenylbenzimidazole Sulfonic Acid · also Ensulizole
Overview
A water-soluble UVB filter, unusual in a category dominated by oil-soluble molecules. Being water-soluble lets it sit in the water phase, which is how some sunscreens achieve a very light, non-greasy feel.
Who it's for
Fluid and gel sunscreens, and hybrid products where a heavy oil phase would defeat the texture the formula is aiming for.
Cautions
It filters UVB only, so it has to be paired for UVA coverage, and it requires neutralisation to a suitable pH to dissolve, which constrains what else the formula can contain. It is not approved in every market, so availability varies by region.
- Effective from
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- Max safe
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What does Phenylbenzimidazole Sulfonic Acid do in skincare?
A water-soluble UVB filter, unusual in a category dominated by oil-soluble molecules. Being water-soluble lets it sit in the water phase, which is how some sunscreens achieve a very light, non-greasy feel.
Is Phenylbenzimidazole Sulfonic Acid considered safe for skin?
It filters UVB only, so it has to be paired for UVA coverage, and it requires neutralisation to a suitable pH to dissolve, which constrains what else the formula can contain. It is not approved in every market, so availability varies by region.