So while the American Academy of Dermatology recommends using a sunscreen with SPF 30 or higher, Kelly advises selecting products labeled “broad spectrum”, which means they shield the skin from both UVA and UVB rays.

Each bottle, tube or spray can of sunscreen is required to list its sun protection factor, or SPF number, to show how much it shields the skin against the sun’s ultraviolet B (UVB) rays, which damage the superficial layers of skin. The SPF number can range from 2 to 100.

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Contrary to popular belief, an SPF of 30 is not twice as effective as a sunscreen with an SPF of 15,” says Kelly, professor and chair of the UCI School of Medicine’s Department of Dermatology.

“It needs to be part of your daily routine to reduce your risk of skin cancer,” says Kelly. “It’s important for everyone, no matter your skin color or ethnicity.”

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In an effort to preserve their reefs and ocean life, seven tourist meccas now ban sunscreens with these chemicals. They are:

“Typically, people put on about one-third to one-half the amount of sunscreen the lab used when determining the SPF number for a product,” she says.

The other 12 chemical agents in sunscreens (cinoxate, dioxybenzone, ensulizole, homosalate, meradimate, octinoxate, octisalate, octocrylene, padimate O, sulisobenzone, oxybenzone, and avobenzone) require additional study to prove they are safe and effective.

“I recommend mineral-based sunscreens to my patients,” says UCI Health dermatologist Dr. Kristen Kelly. “They are protective and less likely to irritate the skin or cause allergic reactions.”

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UCI Health offers dozens of classes, seminars and support groups to help you live well. Take a class, join a group or attend a lecture, and allow us to be your partner in well-being.

Some of the chemical compounds of concern — oxybenzone, octinoxate and octocrylene — also have been found to exacerbate reef bleaching already occurring as ocean temperatures warm around the world.

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The SPF number is a measure of how much longer it takes untanned skin to start to redden with the sunscreen applied vs. how long without it.

“The two most powerful defenses against skin cancer are protective clothing and sunscreen,” says UCI Health dermatologist Dr. Kristen Kelly. “But many people don’t understand how to read a sunscreen label or know what’s necessary for optimal protection.”

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“I recommend mineral-based sunscreens to my patients,” says Kelly. “They are protective and less likely to irritate the skin or cause allergic reactions.”

The FDA also stated in its September 2021 rule change that only two of 16 UV filters used in sunscreens are generally recognized as safe and effective (GRASE). These are the minerals zinc oxide and titanium dioxide.

Until 2012, sunscreen manufacturers were free to make exaggerated claims about their products, describing them as “waterproof” and “sweatproof.” Then the FDA reined them in.

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Kelly recommends at least one ounce — or an average shot glass — of sunscreen to adequately cover your entire face and body. Give yourself at least 20 minutes for the sunscreen to be absorbed before going outdoors.

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Sunscreen is a year-round fact of life for Southern California residents, but choosing a product to protect against skin cancer-causing ultraviolet rays can be confusing and complicated if you don’t know what to look for.

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Now, even broad-spectrum sunscreen rated SPF 15 or higher can’t be labeled “waterproof” or “sweatproof” because no sun-protection product stays on the body when exposed over time to water or perspiration. Nor can a product be called a "sunblock," because no sunscreen is capable of completely blocking the sun's rays.

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For example, if it takes 300 seconds of sun exposure for skin to turn slightly red with a particular sunscreen, and 10 seconds without, 300 divided by 10 equals 30. That sunscreen’s SPF factor is 30.

“Make sure to read the entire sunscreen label, front and back,” she says. “Check to see that the product you’re considering has a ‘skin cancer/skin-aging alert’ in the drug facts section of the label.”

Someone with a light complexion sitting in the Southern California sun at 2 p.m. on a summer day burns a lot faster than they would outdoors in Idaho during the winter. A person with a darker complexion would also be affected differently in the same scenarios.

Beware of sunscreens that aren’t labeled broad spectrum or are broad spectrum but have only an SPF of 2 to 14. These products are required to carry a warning label that they have been shown to reduce sunburn — but not cancer or early aging.

To determine a product’s SPF, manufacturers are supposed to use a simple formula: Divide the number of seconds it takes an untanned patch of skin to slightly redden when covered in sunscreen by the number of seconds it takes unscreened skin to slightly redden.

But Kelly cautions that the SPF number is not a measure of how much time you can stay in the sun. That's because it's difficult to determine with precision how long it takes any one person to get a sunburn without wearing sunscreen.

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A key problem with the SPF rating, Kelly says, is that it only measures a product’s effectiveness against UVB rays, not ultraviolet A rays, which can penetrate the skin more deeply. There is currently no FDA-approved rating system to measure UVA protection levels.

Last fall, the U.S. Food and Drug Administration (FDA) issued a proposed order to help consumers identify key sunscreen safety information to ensure that the product you buy has sufficient UVA protection and doesn’t overstate its SPF factor.

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The clues to look for are the words “water resistant” and “very water resistant.” Products labeled “water resistant” protect for 40 minutes when submerged and those labeled “very water resistant” protect for about 80 minutes.

The good news is that many mineral-based sunscreens work just as well to protect you without harming reefs. Look for non-nano (not small enough to penetrate the skin) sunscreens with zinc oxide or titanium dioxide, which are reef-safe and typically labeled as such.

“First, the highest SPF that can be marketed will be SPF 60 plus, although some formulations may be allowed up to SPF 80. Another important rule change is that any sunscreen rated SPF 15 or higher must include sun filters that allow the product to be considered broad-spectrum.”

The FDA also said that chemical-based sunscreens containing the compounds aminobenzoic acid (PABA) and trolamine salicylate are deemed not safe and effective for sunscreen use.