Magnesium Hydroxide

Magnesium hydroxide is an alkaline inorganic compound used in cosmetics as a pH adjuster and absorbent. It's used for a matte finish, a drier feel, and pH control in select formats, with results depending on concentration and base.
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Ingredient Snapshot

Overview
A mineral compound that mattifies skin and helps balance pH.
Category
Oil Control, Tone/Texture
Type
pH Adjuster

Ingredient Ratings

Overall Rating

Fair

Comedogenic Risk

None

Skin Benefits

Provides quick shine reduction for a more velvety look and may help makeup sit better on oily areas without adding weight, though results can be modest and formula-dependent.

Uses In Skincare & Cosmetics

Found in deodorant creams, mattifying primers, and clay masks for targeted oil-absorbing action. Occasionally used in liquid foundations to adjust finish in oil-prone zones.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

As an alkaline ingredient, it may cause dryness or irritation, especially on sensitive or compromised skin or at higher concentrations. Avoid contact with eyes; no widely recognized cosmetic-specific restrictions.

Is Magnesium Hydroxide a Good Ingredient?

It can mattify and adjust pH, but the benefits are formulation-dependent and its high alkalinity can disrupt skin balance, raising dryness or irritation risk if overused, which is why it sits at Fair. It's best suited to targeted formats and low levels.

Products with Magnesium Hydroxide

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