Ingredient dictionary

Benzophenone-4

Also listed as: Sulisobenzone

Benzophenone-4 is a water-soluble UV filter that absorbs ultraviolet light. Formulators use it in sun care and to help protect formulas from UV light. It is on the label of 9 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Benzophenone-4 does

Absorbs ultraviolet light
Helps keep formulas stable in light
Dissolves easily in water-based products

Benzophenone-4 is a synthetic UV filter. It is a sulfonated form of benzophenone-3, which means a sulfonic acid group has been added to its structure. That group makes it water-soluble, so it blends easily into gels, lotions and rinse-off washes. It mostly absorbs light in the UVB range.

In body washes, cleansers and after-sun products, its role is largely about keeping the formula stable under light, since UV can fade colors and change scents over time. It does not act as sunscreen once rinsed away. Because it dissolves rather than leaving an oily layer, its feel depends mostly on the rest of the formula.

Good for

Suits water-based sun care and after-sun formulas, and is found most often in body washes, cleansers and after-sun products.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is Benzophenone-4 the same as oxybenzone?

No, but they are related. Benzophenone-4 is a sulfonated form of benzophenone-3, which is also called oxybenzone. The added sulfonic acid group makes benzophenone-4 water-soluble, so it behaves differently in formulas.

Can Benzophenone-4 irritate skin?

Any ingredient can irritate sensitive skin, including UV filters. Patch test new products on a small area first. If redness, itching or stinging continues, stop using the product and ask a doctor or dermatologist.