Uses & Benefits

Magnesium hydroxide is a fine white mineral powder best known in natural personal care for controlling body odor without blocking perspiration. It is mildly alkaline, sparingly soluble in water, and naturally occurs as the mineral brucite. Unlike an antiperspirant active, it does not stop sweat; its value lies in making the skin’s surface less favorable to odor-producing activity while also contributing absorbency and a smooth, dry finish.

Underarm Odor Control

• Helps neutralize odor rather than merely covering it with fragrance.

• Its alkaline nature can make the underarm environment less favorable to the processes that create noticeable body odor.

• It is widely used in aluminum-free deodorants, especially formulas designed without sodium bicarbonate.

• It does not reduce the amount of perspiration produced and should not be marketed as an antiperspirant.

Sensitive-Skin Deodorant Support

• Magnesium hydroxide is often chosen as a gentler alternative for people who find baking soda deodorants irritating.

• Its lower solubility generally makes it less immediately reactive on the skin than highly soluble alkaline ingredients.

• Individual sensitivity remains possible, particularly after shaving or when used at a high concentration.

• A finished deodorant should be formulated to minimize irritation rather than assuming the ingredient is universally gentle.

Moisture Absorption & Dry Finish

• The powder can absorb some surface moisture and help reduce a greasy or overly waxy feel in deodorant formulas.

• It contributes a soft, powdery finish that can improve the sensory balance of oils, butters, and waxes.

• It does not prevent sweating and cannot keep the underarms completely dry during heat or physical activity.

Formula Texture & Suspension

• Adds body and opacity to solid deodorants, creams, pastes, and anhydrous balms.

• Because it does not dissolve readily, it must be dispersed thoroughly to prevent grittiness, settling, or uneven application.

• Excessive amounts can create drag, chalkiness, residue on clothing, or a formula that crumbles during use.

• Particle size and supplier quality strongly affect smoothness and finished-product performance.

pH, Compatibility & Safety

• Magnesium hydroxide is alkaline, so concentration and overall formula design matter for underarm comfort.

• It may irritate freshly shaved, broken, inflamed, or highly reactive skin.

• Avoid inhaling airborne powder during manufacturing, and use suitable respiratory and eye protection when handling larger quantities.

• Magnesium hydroxide is not a preservative and cannot protect water-containing products from microbial contamination.

• Cosmetic-grade material should meet appropriate identity, purity, and contaminant specifications.