By ALI VENOSA
Skin Cancer Foundation
Although no single sun protection method is foolproof, research has shown that daily sunscreen use not only reduces skin cancer risk but also helps prevent premature skin aging caused by ultraviolet (UV) rays.
The first thing to consider is the sunscreen’s SPF (sun protection factor). One way to think about SPF is in terms of percentages: SPF 15 filters out approximately 93% of all incoming ultraviolet B (UVB) rays. SPF 30 keeps out 97% and SPF 50 keeps out 98% of UVB.
A sunscreen with a minimum of SPF 15 may be fine for days mostly inside, but if you’re spending an extended amount of time outdoors, pick a water-resistant formula with an SPF of at least 30.
The second thing to check for on a label is the term “broad spectrum.” It’s vital that your sunscreen offers broad-spectrum protection, which means the product protects against both ultraviolet A (UVA) and UVB rays. Both types of UV rays penetrate the skin and cause damage that can lead to skin cancer. So if a sunscreen only screens out one type, you’re leaving your skin vulnerable.
Use one ounce of sunscreen, about the amount that would fit into a shot glass, to cover the entire body. For the face, a nickel-sized dollop works.
The Skin Cancer Foundation recommends applying sunscreen 30 minutes before going outside, then reapplying every two hours and immediately after swimming or sweating.
Water-resistant sunscreens typically offer 40-80 minutes of protection while you’re in the water. No sunscreen is truly waterproof, however, so in these situations, be aware of how long the product claims to protect against moisture, and keep an eye on the clock. With reapplication, a person should use up one 4-ounce bottle of sunscreen during a full day outdoors.
To learn more about sunscreen, visit The Skin Cancer Foundation’s website at skincancer.org to learn more.
