Ingredient dictionary

Trihydroxystearin

Trihydroxystearin is a waxy, castor-derived ingredient that thickens oils and gives creams and sticks their body and structure. It is on the label of 14 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 Trihydroxystearin does

Thickens oils and other base ingredients
Gives creams and sticks structure
Helps keep formulas smooth and stable

Trihydroxystearin comes from castor oil, the pale oil pressed from castor beans. Makers treat that oil with hydrogen in a step called hydrogenation, which turns it into a firm, waxy solid. Its molecules pack together, so it can give oils a thicker, more structured body.

Formulators use it because a little goes a long way in building texture. In shampoos it can help suspend particles and add a smooth feel, while in moisturizers it adds body and a creamy cushion. Because it sets into a solid-like structure, it helps keep a product's texture steady over time.

Good for

Suits people who like richer, creamier textures in shampoos and moisturizers, since it helps formulas feel thicker and hold their shape.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is trihydroxystearin the same as hydrogenated castor oil?

They are close relatives. Both are hardened castor oil materials, and both are used to thicken and add structure. Labels may list either name, so compare ingredient lists to see which one a product uses.

Is trihydroxystearin gentle on sensitive skin?

It is generally well tolerated. People with known reactions to castor-derived ingredients should patch test a new product first, and anyone with a skin concern should ask a dermatologist.