Tan lines are trending again. Unfortunately, so is misinformation about sunscreen. About one in seven Americans under age 35 believe it’s more harmful than direct sun exposure.
"Social media videos that falsely claim sunscreen causes cancer often get more views, shares and comments than science-based information about the damage caused by UV radiation," says Maya Thosani, MD, dermatologist and independent member of the HonorHealth Medical Staff.
Before you toss your SPF, here’s what Dr. Thosani wants you to know about four of the biggest sunscreen myths making the rounds online.
Myth #1: Sunscreen causes cancer
Gen Z influencers point to rising skin cancer rates as proof sunscreen doesn't work. But there’s overwhelming evidence that sunscreen helps prevent skin cancer, says Dr. Thosani.
"Large, randomized clinical trials with long-term follow-up consistently show that regular sunscreen use reduces skin cancer risks,” she adds.
In fact, research shows that regular sunscreen use can reduce melanoma risk by as much as 50%. No sunscreen blocks every ray, but regular use is one of the simplest, most effective ways to stay safe in the sun.
Myth #2: Sunscreen ingredients are dangerous
Certain sunscreen ingredients may be absorbed into the bloodstream after heavy application, but absorption doesn't automatically mean they're unsafe.
If you’re concerned about active ingredients like benzene — a known human carcinogen — or oxybenzone, which has been linked to hormone disruption, there are other alternatives.
"Mineral sunscreens containing zinc oxide or titanium dioxide are generally recognized as safe and effective by the FDA," Dr. Thosani notes.
Myth #3: Sunscreen causes vitamin D deficiency
Vitamin D is essential for bone health, muscle function and more. Since sunlight helps your body make vitamin D, influencers claim sunscreen blocks this process.
"This has been studied extensively," says Dr. Thosani. "Regular sunscreen use has not been shown to cause vitamin D deficiency." Just 30 minutes of sunlight a few times a week is enough for most people to maintain vitamin D levels — and sunscreen doesn’t block all the rays.
Your primary care provider can help check your vitamin levels and may recommend dietary changes or supplements, rather than skipping sunscreen, if you’re low.
Myth #4: Natural alternatives work just as well
Coconut oil. Raspberry seed oil. Shea butter. TikTok is full of “natural” sunscreen hacks, but any UV protection is minimal.
"No alternative or homemade sunscreen provides the same level of protection as commercially available sunscreen," Dr. Thosani says. They may moisturize your skin, but they won't reliably protect it from sun damage or skin cancer.
Your skin keeps score
"UV damage is cumulative. Regularly skipping sunscreen, especially during childhood and young adulthood, increases your lifetime risk of skin cancer and accelerates premature skin aging," Dr. Thosani cautions.
Every sunburn, tanning bed session or afternoon spent outside without protection adds up over time. Research shows:
- Childhood sunburns increase the risk of melanoma and squamous cell carcinoma later in life.
- Indoor tanning before age 35 raises melanoma risk by 60% to 75%.
- Melanoma is one of the most common cancers among adults aged 20 to 39.
The stakes are even higher here in the Southwest. Our intense, year-round UV exposure means your skin accumulates more sun damage over time than in many other parts of the country.
How to separate fact from fiction
Social media makes it easy for misinformation to spread, especially when it sounds convincing. Before changing your health habits, look for information backed by scientific research and talk with a trusted healthcare provider if you have questions.
"The benefits of sunscreen far outweigh the known risks," Dr. Thosani says. "Using sunscreen regularly is one of the simplest things you can do to protect your skin from cancer and premature aging."
In Arizona, sunscreen isn't just another step in your morning routine. It's one of the best investments you can make in your long-term health.