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The Secret Behind Eyelash Growth and Sunscreen's Dark Side

By: Rebecca James Gadberry
Posted: June 11, 2008, from the November 2006 issue of Skin Inc. magazine.

page 6 of 7


  • 3. Wear high-SPF broad-spectrum sunscreen when in direct sunlight. The American Academy of Dermatology has determined that an SPF of 15 offers high enough protection for most people. Broad-spectrum protection means that the sunscreen protects from both UVB and UVA rays.


  • 4. When in direct sunlight, reapply sunscreen often. The Skin Cancer Foundation recommends high SPFs be reapplied every two hours—more often when swimming or sweating—even with a product touted as resistant or very resistant to these activities. Apply generously wherever skin is exposed to sunlight. Advise clients to use the two-finger rule: Apply a line of sunscreen one-eighth inch wide down the lengths of their index and middle fingers. This amount is enough to cover the entire face, ears, neck, throat and upper chest. The rule applies regardless of whether the sunscreen is in the form of a moisturizer, foundation, blush or dedicated sunscreen product. Be sure to emphasize this even when clients apply sunscreen in foundation or moisturizer. Some people may prefer to apply a separate sunscreen to ensure that they get enough protection.


  • 5. Explain to clients that sunscreens are a last resort when sunlight cannot be avoided. No sunscreen completely blocks UV light, regardless of its SPF. In order to fully protect skin from UV exposure, remind clients to stay out of the sun as much as possible and to cover up when they’re in direct sunlight, sitting by a window or in a car. UVA rays—the sun’s aging rays that may be linked to melanoma—can penetrate glass. For this reason, wearing a high-SPF broad-spectrum UVA/UVB sunscreen daily is a good idea.



    1 Sunscreens Can Damage Skin, Researchers Find. University of California, Riverside Newsroom, Office of Strategic Communications (August 29, 2006)