Mica is used in cosmetics to add shimmer and sparkle. It is also popular in skincare products designed to create a glow effect, particularly those marketed as brightening or illuminating. The biggest benefit of mica is its ability to create a natural shimmery finish, since it can be milled to a fine powder. Because it is naturally produced it is a particularly well-loved ingredient among organic and natural beauty brands, and is safe to use on almost all skin types with little to no side effects.