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Aluminum Hydroxide

Details

Officially, CosIng (the official EU ingredient database) lists Aluminum Hydroxide 's functions as opacifying (making the product white and non-transparent), as well as emollient and skin protectant.

However, with a little bit of digging, it turns out Aluminum Hyroxide often moonlights as a protective coating for UV filter superstar Titanium Dioxide. Specifically, it protects our skin from the harmful effects of nasty Reactive Oxygen Species (free radicals derived from oxygen such as Superoxide and Hydrogen Peroxide) generated when Titanium Dioxide is exposed to UV light. Btw, chlorine in swimming pool water depletes this protective coating, so one more reason to reapply your sunscreen after a dip in the pool on holiday.

Other than that, Aluminum Hydroxide also often shows up in composite pigment technologies where it is used the other way around (as the base material and not as the coating material) and helps to achieve higher color coverage with less pigment

Show me some proof

  • Shimizu, Katsumi, and Shoji Takekawa. "Aluminum hydroxide pigments having improved coloring capability." U.S. Patent No. 9,011,893. 21 Apr. 2015.
  • Virkutyte, Jurate, Souhail R. Al-Abed, and Dionysios D. Dionysiou. "Depletion of the protective aluminum hydroxide coating in TiO2-based sunscreens by swimming pool water ingredients." Chemical engineering journal 191 (2012): 95-103.

Products with Aluminum Hydroxide

Alastin Hydratint Pro Mineral Broad Spectrum Sunscreen Spf 36 Coola Face Spf 30 Mineral Sunscreen Cucumber Matte Finish Coola Mineral Face Spf 30 Matte Tint Moisturizer Nu Skin Ap-24® Whitening Fluoride Toothpaste Acorelle Sunscreen Spray For Face And Body Spf 50 Gosh Mineral Full Coverage Foundation Powder Skin79 Non-Chemical Sunblock Spf 50 Pa++++ bioregena Baume Solaire Visage Et Zones Delicates SPF 50+ bioregena Creme Solaire Special Bebe SPF 50+ jane iredale Powder-Me Spf 30 Dry Sunscreen - Translucent Bare Republic Mineral Face Lotion Spf 30 Fizz & Bubble Pineapple Coconut Lip Scrub Ishizawa - Shigaisen Yoho Uv Powder 4+ L'Oreal Paris Makeup Studio Secrets Professional Magic Perfecting Base April Skin Magic Snow Bb Cream Spf50+/Pa+++ SkinMedica Essential Defense Mineral Shield Broad Spectrum Spf 35 Tarte Shape Tape Hydrating Foundation Boots No7 Foundation Drops Giorgio Armani Face Fabric Foundation Noreva Iklen Spf50+ Anti-Brown Spot Photoprotective Cream Sephora Make No Mistake High Coverage Concealer La Roche-Posay Effaclar BB Cream La Roche-Posay Effaclar Bb Blur With Spf 20 St. Tropez Gradual Tan Face Primer Stila One Step Prime Vichy Dermablend Coverstick Clinique Even Better Glow Light Reflecting Makeup Broad Spectrum Spf 15 Missha All Around Safe Block Waterproof Sun Spf50+/Pa+++ Bio essence Bio-Water Sunscreen Spf 50+ Pa++ (Hydrating) Canmake Mermaid Skin Gel Uv Spf 50+ Pa++++ Heliocare 360° Mineral Fluid Spf 50 Perricone MD Photo-Brightening Moisturizer Broad Spectrum Spf 30 Some By Mi Uv Shield Daily Mild Suncream Spf50+ Pa+++ Tarte Babassu Foundcealer Skincare Foundation A'pieu Madecassoside Sun Cream Spf39, Pa++ Becca Under Eye Brightening Corrector Lancôme Teint Idole Ultra Long Wear Foundation Lancôme Teint Idole Ultra Longwear Foundation Stick Make P:rem Uv Defense Me. Blue Ray Sun Cream Nars Pure Radiant Tinted Moisturiser Nars Pure Radiant Tinted Moisturizer Broad Spectrum Spf 30 Neutrogena Sensitive Skin Face Liquid Sunscreen Broad Spectrum Spf 50 Pixi Sun Mist Pudderdåserne Alt I En Beskyttelse Vichy Dermablend Foundation Canmake Mermaid Skin Gel Uv 50+ Pa++++ Canmake Mermaid Skin Gel Uv Spf50 CeraVe Hydrating Sunscreen Face Lotion Broad Spectrum Spf 50 Dr Ceuracle 5 Alpha Control No Sebum Sun Lotion Hourglass Vanish Seamless Foundation Stick