There is a lot of buzz about the use of Titanium Dioxide and Zinc Oxide in sun protection and skin care products. Let's take this opportunity to discuss the science behind the ingredients and address any concerns the recent chatter has sparked. Some Definitions What is Titanium Dioxide (TiO2)1?
The biggest misconception and concern with Titanium Dioxide is not if it is nanotechnology, but rather the question of whether or not these particle sizes penetrate into the deep layers of the skin. There are different sizes and categories of molecules within nanotechnology. Molecules smaller than 20nm can potentially penetrate the dermis. Larger molecules do not move past the epidermis and reside topically on the skin. All Titanium Dioxide used in sun protection uses a form of nanotechnology. The Environmental Working Group researched a 15 peer-reviewed study on skin absorption; nearly all showed no absorption of small-scale titanium sunscreen ingredients through healthy skin. In contrast, studies show that certain chemical sunscreens like Oxybenzone and Octinoxate absorb in large amounts into healthy skin. And using nanotechnology for Titanium Dioxide gives it a translucent appearance, so you won’t look like a white-nosed lifeguard. Types of Sun Screens Physical Titanium Dioxide and Zinc Oxide reside on the surface of your skin and provide a physical shield to reflect the sun’s ultraviolet rays. These ingredients are safe and nontoxic. Additionally, since they don’t include chemical ingredients; physical sun protectants are reef-safe meaning that they will not contribute to the deterioration of our planet’s precious living coral reef ecosystem. Chemical The chemical-laden sunscreens that contain such ingredients as Homosalate, Octinoxate, Octisalate, Oxybenzone should be avoided. These chemicals may act like estrogens in the body, raising risks for breast cancer, and showing effects like hormone-driven uterine damage in other studies. For their full report please visit http://www.cosmeticsdatabase.com/special/sunscreens/nanotech.php The use of sunscreen chemicals may be increasing the incidence of cancer… It also now appears that many heavily used chemical sunscreens may actually increase cancers by virtue of their free radical generating properties. And more insidiously, many commonly used sunscreen chemicals have strong estrogenic actions that may cause serious problems in sexual development and adult sexual function, and may further increase cancer risks. - Dr. Loren Pickart, P&G Skin Care Research Center An educated consumer should research these common chemical sunscreens to understand their effects not only on the human body but also the effects on the environment. Recommended usage include the following protective options to be safer in the sun: 1. Use naturally derived sun protection 2. Wear protective clothing 3. Stay out of the sun, especially during peak hours 1 TiO2 is Non Penetrating – Titanium Dioxide Depots on Skin. TiO2 is an effective broad-spectrum UV filter. Information updated as of March 4, 2011 |
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