Ingredient dictionary

Hydroxyacetophenone

Hydroxyacetophenone is a preservative-support ingredient that helps protect a formula from oxidation and supports its preservative system against microbes. It is on the label of 121 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 Hydroxyacetophenone does

Helps guard against oxidation and rancidity
Boosts the preservative system against microbes
Works alongside other preservatives

Hydroxyacetophenone is a manufactured compound built on a phenol ring, a ring-shaped carbon structure found in many antioxidants. Formulators add it to protect oils and other sensitive ingredients from going off, since oxidation can cause odors and color change over time. It is also a helpful partner for preservatives.

It is usually added in small amounts, so it is not meant to change the scent or feel of a product. You will often see it in creams, lotions, washes, sunscreens and hair color products. Its effect is quiet: it works in the background to keep the formula stable.

Good for

Suits everyday creams, lotions, washes, sunscreens and hair color, where it helps keep the formula fresh and stable.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is hydroxyacetophenone safe?

Our checks do not flag hydroxyacetophenone in any ingredient family. It is used in small amounts in many everyday products. If a product stings or turns your skin red, stop using it and ask a doctor or dermatologist for advice.

Why is hydroxyacetophenone in sunscreen?

Sunscreens contain oils and sun-filter ingredients that can change with light and air. This helps slow that breakdown so the formula keeps working as intended. It is not a UV filter; the sun protection comes from the listed sunscreen actives.