Ingredient dictionary

Pentaerythrityl Tetraisostearate

A thick, oil-soluble ester made from pentaerythritol and isostearic acid. Its main job is to soften, smooth and add a glossy, flexible film. It is on the label of 14 products in our library. Checked against our library November 6, 2026.

What Pentaerythrityl Tetraisostearate does

Softens and conditions the surface
Adds shine and gloss
Helps makeup glide and spread
Forms a light, flexible film

Pentaerythrityl Tetraisostearate is made by joining pentaerythritol, a compound with four reactive arms, to isostearic acid, a branched fatty acid. The result is a large, oily molecule that stays on the surface of a formula rather than soaking in quickly.

Formulators use it in primers and lip care for slip, shine and a soft, flexible finish. It helps pigments spread evenly and makes products feel smoother on the lips and skin. It is oil-based, so it blends well into oily and waxy formulas.

Good for

Anyone who likes smooth, glossy lip products and primers that glide on easily.

Frequently asked questions

Is Pentaerythrityl Tetraisostearate safe for skin?

It is generally well tolerated and is widely used in cosmetics. Like any oil-based ingredient, it can feel heavy on some people, and a patch test is a sensible step if your skin is sensitive. Anyone with a known reaction should check with a dermatologist.

Does Pentaerythrityl Tetraisostearate clog pores?

Oily ingredients can feel heavy, and some people find them congesting, but this varies from person to person. Its large molecules do not sink in quickly, so they can sit on the surface. If you are prone to breakouts, look at the whole formula and try a small test first.