Another band of light called UVA seems to play a role in skin cancer, too. So many products promise “broad spectrum” protection. But with no UVA ratings (at least for now–they may soon be required), there’s no way to tell what you’re getting. You can, however, look for specific ingredients that block UVA, like zinc oxide, avobenzone and titanium dioxide. And if you go to Europe or Canada, try creams containing mexoryl–some researchers consider it the best UVA protection, but it’s not yet available in the United States.
Here’s what’s important: how much sunscreen you put on is as crucial as its SPF. Be generous–use at least one ounce (about a shot-glass full) every time. If your bottle says “waterproof,” don’t assume you can safely dunk in and out of the pool all day. Products have to pass only an 80-minute waterproof test, so you need to reapply every two hours for full protection.
Finally, never rely on creams alone. “I use sunscreen as a third line of defense,” says Dr. Arthur Sober of the American Academy of Dermatology. The first two: stay out of the midday sun–and cover up.
