Ingredient dictionary

Hydrogenated Castor Oil

Also listed as: Castor Wax

A plant-derived wax made from castor oil with added hydrogen. Its main job is to thicken and firm up formulas. It is on the label of 39 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 Hydrogenated Castor Oil does

Thickens oils and water-based creams
Helps keep creams from separating
Gives sticks and balms their shape
Adds stability to formulas over time

Hydrogenated castor oil starts as castor oil, a pale oil pressed from castor beans. The oil is treated with hydrogen, a process called hydrogenation. This changes its structure so it becomes firm and waxy at room temperature instead of liquid. The result is a plant-derived wax that is easy to handle and blend.

Formulators use it because it thickens oils and water-based mixes, helps keep creams from separating, and gives sticks and balms their shape. It also makes products more stable over time. On skin or hair it leaves a smooth, soft feel rather than a greasy one.

Good for

Suits most people, and is a common choice in firm sticks, rich creams and cleansers.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is hydrogenated castor oil safe for skin?

It is widely used in skincare and is generally well tolerated. Anyone can react to any ingredient, so testing a new product on a small patch of skin first is a sensible habit. Stop using it if redness or itching appears.

Is hydrogenated castor oil vegan?

It is made from castor beans, a plant, so it is plant-derived by itself. Whether a whole product is vegan depends on every ingredient, so check the full label.