For Men’s Health, Brian Underwood investigates the flood of sunscreen misinformation on Instagram and TikTok, where influencers wrongly label UV filters as toxic and instead peddle DIY concoctions in their place. Underwood sorts fact from fear, talking with dermatologists, chemists, and skin cancer survivors who are working to reshape the messaging around sun exposure and protection.

Environmental concerns may have also shown up in your feed, with suggestions that these same filters are poisoning our oceans, giving rise to a whole category of sunscreens labeled “reef safe”—a meaningless marketing term that’s not regulated by the FDA (the same goes for products labeled “natural” or “organic”). Dr. Nelson’s point about “low-relevance models” is something to consider here too: The research demonstrating that oxybenzone, octinoxate, and other active ingredients may lead to reef bleaching was done in a lab setting where coral was exposed to levels of these chemicals significantly higher than has been found in the natural environment. It conveniently left out the fact that inorganic filters like zinc oxide (the one typically used in “reef safe” formulas) would have the same effect in similar doses.

More stories about misinformation

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Kai Kupferschmidt | Science | April 30, 2026 | 4,325 words

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The Untold Story of the Insular Texas Family That Invaded the U.S. Capitol

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“The Munns became a national curiosity after five of them were indicted for participating in the insurrection. But the full scope of their malignant behavior is little known—including to the federal prosecutors tasked with investigating their crimes.”

Cheri has been an editor at Longreads since 2014.