Sterling Mineral Makeup
The term micronized refers to particle sizes in the micrometer range. Minerals that are crushed to a fine powder of nano-particles may give flawless coverage, but they may also be a bad idea. Early-stage research indicates that the smallest of nano-scale range particles may be able to cross the blood brain barrier. Having said that, we are surrounded by nano-particles in everyday life and generally suffer no adverse effects and it does seem that more research is needed.
Still if you want to play it safe, Sterling Minerals goes out of its way to use particles that are 5-8 microns. These are too large to do any penetrating, but small enough to give a nice, smooth cover. I also like the fact that Sterling adds in a few things that are actively helpful for the skin, such as soothing allantoin, jojoba seed oil to moisturize and prevent acne flare-ups and kaolin clay to soak up any unwanted oils.
Ingredients in Sterling Mineral Foundation
Titanium Dioxide, Zinc Oxide, Oryza Sativa (Rice) Powder, Boron Nitride, Methicone, Mica, Kaolin Clay, Cold Pressed Simmondsia Chinensis (Jojoba) Seed Oil, Allantoin, Iron Oxides, Ultramarines.