Can Your Sunscreen Cause Skin Cancer?

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A new study has found that an overwhelming amount of sunscreens on the market contain an ingredient that speeds cancerous cell growth. That's right: sunscreen might cause cancer, the very thing people lather it on to protect themselves from.

But don't go throwing out your white creams, sprays, oils, and lotions just yet. Many doctors and dermatologists aren't convinced that sunscreen should go the way of canola oil and old-school Coppertone.

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Dr. Marta Rendon, a board-certified dermatologist and global spokesperson for Procter & Gamble's Head and Shoulders division, tries to assure worried consumers that the results — released last week by the Environmental Working Group, a nonprofit public health organization — come from animal testing only and are the findings of "just one study."

According to that study, nearly half of the 500 most popular sunscreens may actually increase the speed at which malignant cells develop and spread skin cancer such as melanoma.

Why? Because they contain Vitamin A, an ingredient that was added to sunscreen formulations because it's an antioxidant that slows skin aging.

This isn't necessarily new information to Rendon, who acknowledges that some studies suggest "that vitamin A might have some phototoxicity." Still, she says that "it does not necessarily correlate that it'll increase your risk of skin cancer."

To be safe, however, Rendon recommends using sunscreen that blocks both UVA rays — the ones that penetrate the skin more deeply to cause aging issues such as fine lines and wrinkles — and UVB rays, which are the ones that can give you a sunburn and are more responsible for cancer.

"Both forms of ultraviolet light are carcinogenic and increase the risks of skin cancer, but some sunscreens don't target both — most of the new ones are UVA blockers," Rendon says. "You need to block both."

Although in its annual report, the EWG only recommended 39 of the 500 products they examined as safe to use, Rendon says that all FDA-approved sunscreens have undergone rigorous trials to prove their efficacy and hold up against safety standards. (Some brands she recommends? Any with Helioplex, such as Neutrogena's line, or with Mexoryl like La Roche-Posay.)

But regardless of where you stand, she says that by following a few simple rules, you'll be safe in the sun:

  • Check the product label. Make sure your sunscreen includes zinc oxide or titanium dioxide, which act as physical barriers and keep ultraviolet light out best.
  • Don't worry about SPF. Sun protection factor is not regulated by the FDA, and as it turns out, sunscreens with a high SPF — like 70, 80, or 100+ — really don't work any better than those half its count. "The difference between SPF 30 and SPF 60 is maybe five percent," Rendon says. "Those with lighter complexion, freckles, or red hair should use SPF 45 to 50 with good UVA and UVB blockage. For normal complexions, SPF 30 is just fine."
  • Don't under-do it. "A shot glass is the right amount, and reapply every two hours," she says, adding that you can't really ever put on too much.
  • Remember that sunscreen isn't the only armor against sun damage. "You have to be conscious of sun exposure," Rendon warns. "Wear hats and sun-protective clothing."
  • Look for European brands. "It's true that Europe has better sunscreens because they process ingredients faster than we do," she admits.
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