Aluminum Hydroxide

Benefits
Soothing

What is Aluminum Hydroxide?

Aluminum hydroxide is an inorganic compound, chemically Al(OH)3, produced by reacting aluminum salts with alkali. It forms a fine, white, amorphous powder commonly used in cosmetics like foundations, sunscreens, lotions, and creams. In formulations, it works as an opacifying agent by scattering light to reduce transparency, yielding a smooth, creamy visual texture and masking imperfections. It also functions as a skin protectant by creating a physical barrier that helps shield against environmental irritants and moisture loss. As a colorant, it stabilizes pigments for even shade distribution. Its absorbent properties aid in controlling excess oils, while its inert nature makes it suitable for sensitive formulations, enhancing product stability 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:

Opacifying agent
Makes a formula less transparent to create a creamy, opaque look; can also help visually mask suspended particles and improve aesthetic uniformity.
Skin protecting
Forms a barrier to protect skin from external irritants.
Colorant
Provides or corrects color using dyes or pigments, helping achieve a consistent shade and visual appearance across batches and throughout wear.

Benefits

Offers soothing properties to calm irritated skin.

Creates an opaque, uniform appearance in creams and lotions.

Forms a barrier to protect skin from external irritants.

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 sensitive skin needing gentle soothing ingredients.
Those with rare aluminum contact allergies.
Users of makeup or sunscreens seeking creamy, even textures.
People preferring completely aluminum-free products.
Individuals desiring protective layers in daily skincare routines.
Anyone experiencing irritation upon patch testing.

Safety Notes

  • Considered low hazard for cosmetic use by safety review panels.
  • Non-comedogenic and unlikely to clog pores.

Frequently Asked Questions about Aluminum Hydroxide

Is aluminum hydroxide safe for daily skincare?

Yes, it rates as low hazard and safe in cosmetics per expert reviews.

Does it clog pores?

No, it has a comedogenic rating of zero.

What products commonly contain it?

Found in foundations, sunscreens, lotions, and opaque creams.