Ingredient dictionary

Cetearyl Isononanoate

A light, silky oil-like ester made from a fatty alcohol and a branched fatty acid. It softens skin and helps products spread smoothly. It is on the label of 13 products in our library. Checked against our library November 6, 2026.

What Cetearyl Isononanoate does

Softens and smooths the skin's surface
Helps products spread evenly
Adds a light, non-greasy feel

Cetearyl Isononanoate is an ester, a molecule formed when two ingredients join together. Chemists make it by combining cetearyl alcohol, a blend of two fatty alcohols often made from plant oils, with isononanoic acid, a branched-chain fatty acid. The branched shape keeps the ingredient liquid at room temperature.

Formulators use it as an emollient, which means it softens skin and helps it hold on to moisture. It spreads easily and leaves a soft, non-greasy finish, so it suits lightweight lotions, sunscreens and makeup. It also helps a formula keep an even, smooth texture.

Good for

Anyone who wants a smooth, lightweight feel in moisturizers, makeup, makeup removers and sunscreens, especially if heavy textures feel greasy.

Frequently asked questions

Is Cetearyl Isononanoate safe for skin?

Cetearyl Isononanoate is widely used in skincare and makeup and is generally well tolerated. As with any cosmetic ingredient, a small number of people may react to it. If your skin is sensitive, try a new product on a small patch first and stop using it if irritation appears.

Does Cetearyl Isononanoate clog pores?

It is a light ester that many people find comfortable on the skin. Whether a product clogs pores depends on the whole formula and on your skin, not on one ingredient. If you break out easily, try a small amount on your jawline before using it widely.