Why Sunscreen Lies Travel Faster Than the Truth on TikTok
Knowing why anti-sunscreen videos go viral helps you spot the next one, so here is the playbook misinformation uses and how to fact-check your feed.
Columbia University's Herbert Irving Comprehensive Cancer Center documented the 2025 surge of anti-sunscreen TikTok claims, that sunscreen is toxic, cancer-causing, or blocks vitamin D, and noted that melanin offers only minimal added protection while a tan reflects DNA damage rather than safety.
Cancer center experts caution that viral anti-sunscreen claims oversimplify or misrepresent the science, and that a tan, far from signaling health, is the visible result of UV-induced DNA damage.
Questions we get a lot
Does sunscreen cause cancer?
No. This is one of the anti-sunscreen claims that surged on TikTok in 2025, but it is not supported by evidence. Columbia University's Herbert Irving Comprehensive Cancer Center documented and debunked this myth, noting that sunscreen helps protect against UV damage that drives skin cancer. The viral framing oversimplifies and misrepresents the science.
Does sunscreen block vitamin D?
The claim that sunscreen prevents vitamin D production is among the myths Columbia oncologists addressed in 2025. In real-world use, sunscreen does not eliminate vitamin D synthesis, and the cancer-prevention benefit of sun protection is well established. If you are concerned about vitamin D, diet and supplements are safer sources than unprotected UV exposure.
Is a tan actually a sign of healthy skin?
No. According to Columbia's cancer center, a tan reflects DNA damage rather than safety or health. The skin darkens as a defensive response to UV injury. Relying on melanin instead of sunscreen is risky, since melanin offers only minimal added protection.
r/SkincareAddiction: 'My FYP is full of people saying sunscreen causes cancer and blocks vitamin D. How do I tell what's actually true?'