Sunscreen: The Rough Guide

Confused about which sunscreen is right for you? Here's a little survival course.

• In general, look for a product rated SPF 15 or higher. Greater protection may be needed for children, for very long exposure, or in extreme climates such as high altitude or southern latitudes.
• If you spend a lot of time in the sun, are very fair or have had skin cancer, consider a sunscreen with titanium dioxide or zinc oxide. These agents block or reflect light, thus protecting from both UVA and UVB, which can damage the skin and lead to cancer.
• Apply sunscreen at least 20 to 30 minutes before going out into the sun. Compounds need to bind to proteins in the skin to become effective.
• Use sunscreen liberally and often. One ounce is about right to cover all the exposed skin of an average-sized adult. Reapply sunscreen every four hours, unless swimming or sweating, in which case you should reapply it every two hours.
• Don't forget your lips and eyes. Apply a lip balm rated SPF 15 or higher, and wear UV-blocking sunglasses.

Even when following the above tips, there is no way to achieve a "healthy suntan". If you want a bronzed look, try a self-tanning product. To date, these products are considered safe, but since they don't always provide sun protection, you still need to apply sunscreen before heading outdoors. Most importantly, you should have your skin checked from head to toe each year by a physician.