Magnesium Carbonate

Benefits
Cleansing

What is Magnesium Carbonate?

Magnesium carbonate is an inorganic mineral salt formed from magnesium and carbonic acid, existing as a fine, white, lightweight, water-insoluble powder. In cosmetics, it appears in face powders, dry shampoos, deodorants, and cleansing products like soaps and scrubs. It works by soaking up sebum and water to deliver a drier, less shiny skin feel, while bulking up formulas for better texture and volume. As an opacifier, it creates a smooth, creamy look by reducing transparency. It also binds particles for firmer pressed products, adjusts and buffers pH for stability and comfort, supporting overall formula performance without adding greasiness.

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.
Bulking agent
Increases mass/volume to build structure and improve handling, commonly used to adjust feel, spread, and cost-in-use without acting as a primary active.
Opacifying agent
Makes a formula less transparent to create a creamy, opaque look; can also help visually mask suspended particles and improve aesthetic uniformity.
PH adjuster
Raises or lowers pH to the target range, supporting ingredient performance, preservative efficacy, stability, and user comfort.
Binding
Provides cohesion by helping ingredients stick together, improving the strength and integrity of pressed powders, tablets, or solid bars.
Buffering agent
Maintains the pH stability of a formulation.

Benefits

Absorbs excess sebum and moisture to mattify skin and reduce shine.

Cleanses by drawing out oils and impurities in powder or bar formats.

Stabilizes pH and enhances texture for lighter, more spreadable products.

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 shiny skin seeking oil control.
Individuals with rare magnesium compound sensitivities.
Users of powders and dry products for a fresh feel.
People sensitive to inhaling fine powders.
Those wanting stable, gentle cleansing without residue.
Those preferring hydration-focused ingredients over absorbents.

Safety Notes

  • Low hazard rating from environmental health assessments.
  • Safe for use in cosmetics per expert safety reviews.

Frequently Asked Questions about Magnesium Carbonate

What does magnesium carbonate do in skincare?

It absorbs oils and moisture, cleanses gently, bulks products, and maintains pH stability.

Is magnesium carbonate safe for skin?

Yes, it has a low safety hazard profile and is approved for cosmetic use.

Which products contain magnesium carbonate?

Common in face powders, dry shampoos, deodorants, and cleansing bars.