How effective is your sunscreen?
Washington D.C. [USA], May 24 : Sunscreen is of utmost importance to protect your skin from the harmful rays of the sun. With a whole myriad of advertisements flashing on the screens on a daily basis, consumers struggle to choose which products are the safest.A new report released by the Environmental Working Group claims that 73% of the 880 sunscreens it tested don't work as well as advertised or contain "worrisome" ingredients.
The authors of the annual report say they hope to help consumers make smarter choices when choosing the right products -- because not all sunscreens are made equal.
"Sunscreens are really mismarketed, and as a result, people who depend on them think they are far more powerful than they really are," said Sonya Lunder, a senior analyst with the environmental advocacy group and lead scientist of the 2017 Sunscreens Guide.
After examining the SPF protection, chemical ingredients and overall safety and effectiveness of several sunscreens, moisturizers and lip balms, the advocacy group compiled a list of its best- and worst-rated products.
A guide released this month by Consumer Reports also rated sunscreen products for safety, UV protection, water resistance and cost. Of the 58 products tested, researchers named 15 that met their standards. 20 were found to offer less SPF protection than advertised.
-How high is too high?
Dermatologists recommend using sunscreen to block the sun's ultraviolet rays. *Both* of the two types of UV rays can cause skin cancer. A UVA ray, the longer wave of the two, penetrates the skin deeply and is less likely to burn and show signs of overexposure.
UVB rays are shorter and tend to damage the outer layer of the skin, causing sunburn. Both are linked to melanoma and other skin cancers. Most sunscreens sold today help protect against both.
The phrase "broad spectrum" signifies that a sunscreen offers some protection from UVA rays. The Sun Protection Factor (SPF) number is the level of protection a sunscreen provides against UVB rays, waves of light from the sun that are damaging to the outer surface of the skin.
Dr. Dawn Davis, a dermatologist at the Mayo Clinic who was not involved in the new reports, says SPF is a ratio of how long a person without sunscreen can be in the sun without experiencing any redness divided by the amount of time you can spend in sunlight with a product on.
In other words, "if you're standing on the equator at high noon and it would usually take your skin one minute without sunscreen to become red and irritated, SPF 15 means you can stand in that same sun exposure for 15 minutes."
But SPF 15 may not be enough for extended coverage. The American Academy of Dermatology recommends choosing a sunscreen that is at least SPF 30, which would block 97% of UVB rays.
So more is better, right? Not so fast, says Lunder. Several brands offer products with a high SPF, even over 100. But, she says, consumers are not getting the protection they think they are.
"People who buy high-SPF products are more likely to get burned because they assume they're getting better and longer-lasting protection," she said.
Maximum protection comes when sunscreen is reapplied every few hours, and Lunder says people who buy these high-SPF products do not reapply often enough to have continuous skin protection. She recommends sticking to products between SPF 30 and 50.
Whether for wrangling little ones at the pool or looking for quick protection on the go, aerosol sunscreens have gained popularity as quick and mess-free alternatives to traditional creams.
But researchers say aerosol sunscreens, often marketed as "sport" versions, could offer less protection. A 2015 study found that people who used sprays applied less than those using creams.
Although Lunder says the EWG "recommends people avoid aerosols," Davis notes that those products "can be effective, and you can get the SPF protective factor, but you have to be conscientious to apply it homogeneously. And of course don't inhale the sunscreen, or it can be irritating."
There have also been separate concerns raised over a potential danger from inhaling sunscreen when its sprayed.
-The chemical factor
Many products rely on chemicals to create a barrier on the surface of the skin to block rays. Some of these chemicals are extremely helpful, but others may have damaging effects.
Davis suggests that people with skin allergies or sensitive skin should "look for a sunscreen that contains zinc oxide and titanium oxide, which are physical blockers and tend to be hypoallergenic."
EWG representatives say parents and consumers should use caution with two ingredients, oxybenzone and retinyl palmitate.
Lunder says the first, oxybenzone, "is a hormone disruptor that mimics body hormones and affects reproductive tract and other hormones."
Retinyl palmitate, a form of vitamin A, has been the topic of years of debate and research. Some researchers have found it to be dangerous and say it may be linked to the development of skin tumors under direct UV light. However, these studies have examined retinyl palmitate only as it reacts to UV radiation in isolation, not on human skin.
Other researchers have found no link to between the chemical and skin cancer and determined that any potential dangers of retinyl palmitate are countered by antioxidants like vitamins C and E present in the body.