Aluminum hydroxide is used as a skin protectant and opacifier (to reduce transparency) in cosmetics. It can be used in many products such as foundations, lipsticks, and moisturizers.

Many sunscreens use aluminum hydroxide as a film on the titanium dioxide to prevent it from clumping so that it can be applied evenly. In addition to preventing it from penetrating the skin, it can also form a refractive layer to help the skin reflect UV rays.

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