Ingredient dictionary

Alumina

Also listed as: Aluminum oxide

Alumina is aluminum oxide, a fine mineral-based powder made from aluminum and oxygen. In cosmetics it mainly adds gentle texture and helps formulas feel smooth. It is on the label of 23 products in our library. Checked against our library November 6, 2026.

What Alumina does

Gently buffs loose surface flakes in cleansers
Adds bulk and a smooth feel to powders
Gives lotions a smooth, even texture

Alumina is aluminum oxide, a fine mineral-like powder made from aluminum and oxygen. It is commonly produced from bauxite, the ore that aluminum is refined from. Once milled, it is a stable powder that does not dissolve in water or oil, so it stays as tiny particles within a formula.

Formulators like alumina for its hard, fine particles. In a cleanser, they add a gentle polish that helps lift loose surface flakes as you rinse, which can feel faintly gritty. In body lotions, it helps give an even, smooth texture.

Good for

Suits shoppers who like a cleanser or body lotion with a smooth, lightly textured feel.

Frequently asked questions

What does alumina do in a cleanser?

It acts as a mild abrasive. Its fine particles gently buff away loose surface skin cells as you rinse. It is not a strong scrub, so it is usually only a small part of the cleanser's job.

Is alumina safe in body lotion?

Alumina is generally well tolerated in cosmetics. Its particles do not dissolve in water or oil. If any product feels irritating on your skin, stop using it and check with a dermatologist.