There is ongoing research regarding most mineral ingredients by the FDA and research teams. RAESIN IMAGES Mineral Makeup Cosmetics research, development, and formulating teams want to make sure women feel completely comfortable and safe with the ingredients we provide in our formulas. We choose not to use high mica substrate particles in any of our mineral foundations, pressed or liquid mineral makeup products. Depending on the micronization levels mica can/does cause surface abrasions. Mica substrate particles in mineral foundation or face powder Ingredients may cause cystic acne lesions by cutting/tearing small microscopic holes in delicate facial tissue, thus allowing microbial bacterial from the air, touch, phone, cell use, or any pollutants from any touched surface to enter.