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

Coola Face Spf 30 Mineral Sunscreen Cucumber Matte Finish Coola Mineral Face Spf 30 Matte Tint Moisturizer Gosh Mineral Full Coverage Foundation Powder Skin79 Non-Chemical Sunblock Spf 50 Pa++++ April Skin Magic Snow Bb Cream Spf50+/Pa+++ Noreva Iklen Spf50+ Anti-Brown Spot Photoprotective Cream Sephora Make No Mistake High Coverage Concealer Stila One Step Prime Bio essence Bio-Water Sunscreen Spf 50+ Pa++ (Hydrating) Heliocare 360° Mineral Fluid Spf 50 Becca Under Eye Brightening Corrector Lancôme Teint Idole Ultra Longwear Foundation Stick Make P:rem Uv Defense Me. Blue Ray Sun Cream Nars Pure Radiant Tinted Moisturizer Broad Spectrum Spf 30 Canmake Mermaid Skin Gel Uv Spf50 Kat Von D Lock-It Concealer Creme Maybelline Superstay Matte Ink Liquid Lipstick Lancôme Teint Idole Ultra Long Wear Foundation Too Faced Primed & Peachy Primer bareMinerals Barepro™ Performance Wear Liquid Foundation Broad Spectrum Spf 20 Althea Petal Velvet Sunaway Spf50+ Pa++++ CARENEL No Sebum Perfect Uv Shield Spf50+/Pa++++ Cetaphil Daily Defence Moisturiser Spf50+ Dr. G Green Mild Up Sun Spf50+ Pa++++ La Roche-Posay Cicaplast Baume B5 La Roche-Posay Uvidea Xl Melt-In Cream Spf50 Lancôme Teint Idole Ultra Custom Highlighting Drops Make P:rem Blue Ray Sun Cream Spf 50+ Pa++++ Make P:rem Blue Ray Sun Fluid Spf 50+ Pa++++ Tarte Amazonian Clay 12-Hour Foundation Spf 15 Ultrasun High 30 Spf Face it Cosmetics Anti-Aging Armour Chanel Vitalumière Aqua Ultra-Light Skin Perfecting Makeup Spf 15 Marks & Spencers Formula Absolute Total Lip & Eye Too Cool For School Mild Cica Sun Lotion Spf50+ Pa++++ Vichy Uv Protect Skin Defense Daily Care - Anti-Shine Cream Spf 50 it Cosmetics Your Skin But Better Cc+ Cream With Spf 50+ Biore Uv Bright Milk Spf 50+/ Pa+++ Cyberderm Simply Zinc Ultra Sun Whip Spf 50 Fenty Beauty Pro Filt'R Soft Matte Longwear Foundation L'oreal White Perfect Clinical Overnight Cream LANEIGE Bb Cushion Pore Control La Roche-Posay Anthelios Ka Spf50+ La Roche-Posay Uvidea Xl Tone-Up Light Cream Spf50+ Sulwhasoo Perfecting Cushion Ex Vichy Ideal Soleil Face & Body Hydrating Milk Spf 50 IPKN Big Apple Sun Cream Spf 50 La Roche-Posay Anthelios Xl Spf 50+ Dry Touch Gel-Cream Anti-Shine Sulwhasoo Perfecting Cushion Brightening Etude House Play 101 Stick Foundation