Ingredient dictionary

Magnesium Aluminum Silicate

A natural clay mineral that swells in water to form a soft gel, and its main job is to thicken and keep a formula evenly mixed. It is on the label of 18 products in our library. Checked against our library November 6, 2026.

What Magnesium Aluminum Silicate does

Thickens water-based formulas
Keeps particles evenly suspended
Helps stabilize texture
Adds a soft, cushiony feel

Magnesium Aluminum Silicate is a mineral from the smectite clay family. It is usually sourced from natural clay deposits, then purified and milled into a fine powder. Being a mineral, it does not behave like an oil or wax, which is why it suits water-based formulas.

Formulators add it to cleansers to thicken the water phase and keep oils, powders, and small particles evenly spread. It does not dissolve, so it swells slowly and forms a soft gel instead. On skin, it gives a smooth, slightly cushiony feel, and it rinses away easily. It is generally well tolerated.

Good for

Suits cleansers and other wash-off products that need a smooth, even, creamy texture.

Frequently asked questions

Is Magnesium Aluminum Silicate safe for sensitive skin?

It is generally well tolerated and is used in many wash-off products. It is not commonly linked to irritation. Anyone with sensitive skin should still patch test new products and stop using anything that stings or causes redness.

What does Magnesium Aluminum Silicate do in a cleanser?

In a cleanser it thickens the formula and helps keep it evenly mixed. It can make the texture feel softer and more cushiony in the hand. It also helps stop heavier particles from settling at the bottom of the bottle.