The Sunscreen Misinformation Problem: Why TikTok's Most Viral Videos Are Also the Most Dangerous

If you've searched for sunscreen advice on TikTok, you've probably seen it: creators claiming that chemical sunscreens cause cancer, that SPF is a scam, that your sunscreen is giving you microplastics, or that you're better off getting vitamin D from the sun than protecting your skin.

You're not alone. A new study published Thursday in PLOS Digital Health analyzed nearly 1,000 TikTok videos across the five most popular sunscreen-related hashtags and found something that should worry anyone who cares about public health: the vast majority of sunscreen content on TikTok is accurate — but the videos that go viral, the ones that millions of people actually see, are the ones spreading misinformation.

It's a dynamic that researchers are calling the "virality-inversion problem": good information exists in large quantities, but bad information spreads faster and reaches more people. And when the subject is skin cancer prevention, the stakes are literal life and death.

## What the Study Found

Researchers from the University of Alberta, led by Alessandro Marcon, conducted one of the most comprehensive analyses of sunscreen information on social media to date. Their findings were a study in contradictions:

- **87% of the videos** they analyzed promoted sunscreen use and contained accurate information about sun protection - **The videos with the highest engagement** — the most views, likes, shares, and comments — were disproportionately the ones containing misinformation - **The most common false claims** were that sunscreen causes cancer, contains toxic chemicals, disrupts hormones, contaminates breast milk, or is unnecessary because the sun provides sufficient vitamin D

The mismatch between accuracy and reach is the core problem. Accurate content exists, but it's drowned out by sensationalized claims that tap into people's fears about what they put on their skin.

"There were specific mentions that sunscreen has a hormone-disrupting potential, it was cancer-causing, contained carcinogens, it could taint your breast milk or contain microplastics," Marcon said.

## The Chemical vs. Mineral Debate

Much of the misinformation on TikTok focuses on so-called "chemical" sunscreens — products that use active ingredients like oxybenzone, avobenzone, and octinoxate to absorb UV radiation. The claims are that these chemicals are toxic, that they enter the bloodstream, and that they pose long-term health risks.

The study directly addressed this: "There are currently no scientific indications that any ingredient widely used in 'chemical' sunscreens (e.g. oxybenzone) is harmful to one's health."

Dr. Molly Hales, a dermatologist and researcher at the University of Chicago, reinforced the point: "Both chemical and mineral sunscreens' ingredients are monitored and regulated by the FDA, which means they go through rigorous safety profiling, safety testing before they're allowed to be sold, even though they are over-the-counter products."

Mineral sunscreens — which use zinc oxide or titanium dioxide to physically block UV rays — are often promoted on social media as the "safe" alternative. And while they are effective and well-tolerated, the implication that chemical sunscreens are dangerous is not supported by the evidence. Both types protect against skin cancer. The best sunscreen is the one you'll actually use.

## The Vitamin D Myth That Won't Die

One of the most persistent misinformation claims on TikTok is that sunscreen causes vitamin D deficiency. It sounds plausible: if you block UV rays, you block your body's ability to synthesize vitamin D, right?

Dr. Anthony Rossi, a dermatologist at Memorial Sloan Kettering Cancer Center in New York, addressed this directly: "There have been numerous studies that show even with regular daily use of sunscreen, you do not become vitamin D deficient."

The reason is simple: you don't need much UV exposure to produce adequate vitamin D. Most people get enough through incidental sun exposure — walking to their car, sitting by a window, spending a few minutes outside — even while wearing sunscreen. The vitamin D argument against sunscreen is not just wrong; it's dangerous, because it gives people a reason to skip protection that prevents skin cancer.

## Why Misinformation Goes Viral

The PLOS study highlights a structural problem with how information spreads on social media:

**Fear outperforms reassurance.** A video claiming that your sunscreen is giving you cancer triggers an immediate emotional response — fear, anxiety, urgency to share. A video explaining that FDA-regulated sunscreen ingredients are safe triggers... not much. The algorithm rewards engagement, and fear generates more engagement than calm evidence.

**Certainty sells.** TikTok creators who present complex topics as simple — "sunscreen is toxic" — attract more viewers than those who acknowledge nuance — "the evidence shows sunscreen ingredients are safe at the levels used." People want clear answers, and misinformation provides them.

**Visual proof is easy to fake.** Videos showing sunscreen failing to dissolve in water (supposedly proving it contains harmful chemicals) or causing skin reactions are compelling to watch, even if they're misleading. Scientific studies don't make good short-form video content.

**Algorithm amplification.** When a misinformation video gets initial engagement, TikTok's algorithm pushes it to more people, creating a feedback loop. Accurate content, even if it's abundant, doesn't benefit from the same amplification.

## The Real Risks You Should Worry About

The actual statistics on skin cancer are stark:

- **1 in 5 Americans** will develop skin cancer by age 70 - **Melanoma**, the deadliest form, has a 99% survival rate when caught early — but drops dramatically once it spreads - **More people are diagnosed with skin cancer each year** than all other cancers combined - **UV exposure** is the most significant modifiable risk factor for skin cancer

The risk of NOT wearing sunscreen is well-documented and severe. The risks claimed by TikTok misinformation are not.

## What This Means For You

- **Wear sunscreen. Every day.** This is not complicated. The American Academy of Dermatology recommends SPF 30 or higher, broad-spectrum protection, and water resistance. Apply 15 minutes before sun exposure and reapply every two hours.

- **Chemical and mineral sunscreens are both safe and effective.** Choose whichever formulation you prefer — the best sunscreen is the one you'll actually use. If mineral sunscreens give you peace of mind, use them. If you prefer the texture and feel of chemical sunscreens, use those. Both are FDA-regulated and both protect against skin cancer.

- **Don't get your health information from viral TikTok videos.** The study's finding that misinformation is more viral than accurate information should tell you everything you need to know about the platform as a health resource. If a claim sounds alarming, verify it with a dermatologist or a reputable source like the American Academy of Dermatology.

- **You're probably not vitamin D deficient because of sunscreen.** If you're concerned about your vitamin D levels, get a blood test. Taking supplements is far safer than skipping sunscreen to get more sun.

- **Share the accurate content.** The study found that accurate sunscreen information exists on TikTok — it just doesn't go viral. If you see good information, engage with it. Comment, like, share. The algorithms respond to engagement, and right now, they're rewarding fear over facts.

- **Talk to a dermatologist, not an influencer.** Skin cancer is one of the most preventable and treatable cancers when caught early. Annual skin checks and daily sunscreen use are the two most impactful things you can do. No TikTok video, however viral, should convince you otherwise.