Nanoparticles in Your Sunscreen - What is all the fuss about?
Here at Batra Dermatology, we stress the importance of a physical block sunscreen with active ingredients of zinc oxide or titanium dioxide to ensure the best protection for your skin. Because these ingredients tend to make the sunscreen appear white on the skin when applied, companies have worked to decrease the size of these particles in an attempt to make sunscreen look less visible. When titanium dioxide or zinc oxide is ground so small that it is considered a "nanoparticle", less than 100 nanometers (a nanometer is one millionth of a millimeter), people become concerned that these particles will be absorbed into the skin and have carcinogenic effects.
While nano-sized titanium dioxide particles have been used in sunscreens since the 90s, most physical block sunscreens now-a-days use micronized particles as oppose to nano-sized. Micronized zinc oxide and titanium dioxide particles remain on the top outer layer of your skin, called the stratum corneum, and are not absorbed. They form a protective layer outside your skin to protect it from harmful UV rays.
Micronized zinc oxide and titanium dioxide base sunscreens may be appear little white in appearance, but try our Batra Block for a good sunscreen that has a tint to offset the white color! Don't like the feeling of sunscreen on your skin, we love ColoreScience's Mineral Sunscreen Brush to powder on your sunscreen before going out.