Aluminum Hydrate

What is Aluminum Hydrate?

Aluminum Hydrate is an inorganic compound, chemically a hydrated form of aluminum oxide or hydroxide (Al(OH)3·nH2O), derived synthetically from aluminum salts or naturally from minerals like bauxite. It appears as a fine, white, odorless powder widely incorporated into skincare creams, lotions, foundations, and sunscreens. In formulations, it works by interacting with water and oils to thicken mixtures, reduce transparency for a uniform opaque finish, and create a lightweight barrier that shields the skin surface from environmental factors. Its absorbent properties help manage excess shine while promoting even application, and its neutral pH compatibility supports stability in emulsions without disrupting other active components. This multifunctional material contributes to sensory appeal and performance in daily-use personal care products.

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:

Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Humectant
Attracts and holds water in the stratum corneum, boosting hydration and plumpness; commonly used in moisturizers, cleansers, and hair conditioners.
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.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Provides a smoothing effect on skin texture for better feel.

Supports moisture retention to help maintain hydration levels.

Enhances product consistency and visual appeal in creams and lotions.

Who It's For

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

Who May Benefit Who Should Avoid
Individuals seeking softer, smoother skin from daily moisturizers.
Those with known hypersensitivity to aluminum compounds.
People desiring non-greasy formulas with improved spreadability.
People applying products to broken or irritated skin.
Users of opaque cosmetics looking for even coverage and stability.
Individuals preferring aluminum-free formulations on principle.

Safety Notes

  • Recognized as safe for cosmetic use by expert review panels.
  • Exhibits low potential for skin irritation in typical concentrations.

Frequently Asked Questions about Aluminum Hydrate

What is Aluminum Hydrate used for in skincare?

It thickens products, adds opacity, smooths skin, and helps protect the surface.

Is Aluminum Hydrate safe for daily use?

Yes, it has a low safety rating and is suitable for most skin types in cosmetics.

Does it cause irritation?

Evidence shows low irritation potential from authoritative cosmetic safety assessments.