Magnesium Aluminum Silicate

Benefits
ProtectionSoftening

What is Magnesium Aluminum Silicate?

Magnesium Aluminum Silicate is a purified, naturally occurring smectite clay mineral derived from volcanic ash deposits, belonging to the phyllosilicate group with a layered structure of magnesium, aluminum, and silica sheets. In cosmetics, it appears as a fine, off-white powder commonly used in lotions, creams, foundations, and powders. It functions by absorbing water and oils due to its high surface area and swelling capacity, forming clear, thixotropic gels that stabilize emulsions, suspend particles, and control viscosity for smoother application. This clay also reduces tackiness, improves spreadability, and creates opacity in formulations, contributing to a lightweight, matte finish across oil-in-water and water-in-oil systems without altering pH significantly.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Absorbent
Absorbs water and/or sebum to reduce greasiness and shine, improve dry touch, and help keep powders and emulsions feeling lighter on skin.
Anticaking agent
Prevents powders from clumping by reducing moisture pickup and improving flow, keeping loose and pressed powders uniform during storage and use.
Opacifying agent
Makes a formula less transparent to create a creamy, opaque look; can also help visually mask suspended particles and improve aesthetic uniformity.
Slip modifier
Improves the spreadability and glide of products on skin.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

- Helps absorb excess sebum for a less greasy feel.

- Softens skin texture through gentle smoothing action.

- Provides a protective layer that enhances product stability on skin.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
- People with oily or combination skin seeking matte effects.
- Individuals with rare clay mineral sensitivities.
- Users of creams and makeup wanting better spread and longevity.
- People experiencing dryness from absorbent ingredients.
- Those preferring lightweight formulas that feel dry and non-sticky.
- Those preferring non-mineral based thickeners.

Safety Notes

  • - Rated low hazard by EWG with scores of 1.
  • - Deemed safe for cosmetic use by Cosmetic Ingredient Review.

Frequently Asked Questions about Magnesium Aluminum Silicate

Is Magnesium Aluminum Silicate safe for daily use?

Yes, it's considered safe in cosmetics by expert reviews with low hazard ratings.

Does it clog pores?

It has a comedogenic rating of 0, making it suitable for acne-prone skin.

What skin types benefit most?

Oily and combination skin types appreciate its sebum-absorbing and mattifying properties.