Magnesium Hydroxide: The Gentle Mineral for Natural Deodorant & Skincare
Milk of magnesia reimagined — aluminum-free odour control, oil-absorbing masks, and soothing creams
Magnesium hydroxide (Mg(OH)₂) — commonly known as milk of magnesia — is a gentle, multi-functional mineral with a 200-year history in medicine and wellness. Today, it’s a star ingredient in natural cosmetics, offering aluminum-free deodorant action, oil control, and soothing relief for sensitive skin. This Australian formulator’s guide explores the science, benefits, and DIY uses of cosmetic-grade magnesium hydroxide.
What is Magnesium Hydroxide?
White, odourless powder — slightly soluble in water, forming a mildly alkaline suspension (pH ~10). Sourced from brucite mineral or seawater.
Key Properties
- Neutralises acids (odor, sebum)
- Non-irritating — safe for sensitive skin
- Absorbent — controls oil without drying
- Anti-inflammatory — calms redness
Cosmetic Uses of Magnesium Hydroxide
1. Natural Deodorants (Aluminum-Free)
Replaces baking soda & aluminum — neutralises odor without blocking pores.
- Use level: 5–15% in cream/stick
- Texture: Smooth, non-gritty
- Sensitive skin safe
DIY Magnesium Deodorant Cream
- 30 g Magnesium Hydroxide
- 40 g Shea Butter
- 20 g Coconut Oil
- 10 g Arrowroot Powder
- 10 drops Lavender Oil
- Melt shea + coconut oil
- Whisk in Mg(OH)₂ + arrowroot
- Add EO, pour into tin
- Cool 2 hrs
2. Face Masks & Cleansers
Oil-absorbing clay alternative — gentler than kaolin.
- Use: 10–30% in powder masks
- Best for: Oily, acne-prone, sensitive
3. Toothpaste & Oral Care
Mild abrasive + pH buffer — whitens without enamel damage.
4. Soaps & Body Washes
Add 1–3% for mild cleansing and skin-soothing effect.
Other Uses
- Antacid: Neutralises stomach acid
- Laxative: Osmotic effect
- Flame Retardant: Releases water when heated
Ultra-Fine Powder | Australian Stock | Deodorant & Skincare