Sunscreen: Could It Be Toxic??

August 27, 2026

AI Summary

5 min read

On social media, people are telling you to ditch your sunscreen. Some say you’re blocking out the sun’s “gorgeous rays” and robbing your body of vitamin D. Others claim sunscreen is straight-up toxic—that it seeps dangerous chemicals into your blood and messes with your hormones. A widely shared video clip warns that “two hours after applying it to the skin, these toxic environmental estrogens can actually be detected in the blood.” And then there’s the claim that sunscreen itself could be causing cancer: “When they compare sunscreen users to non-sunscreen users, the sunscreen users faced increased risks of all the major skin cancers.” So what is actually going on? Science Vs host Wendy Zuckerman and producer Michelle Dang spent years wanting to answer this question, and they finally dug into the evidence. The picture that emerges is more nuanced than either the alarmists or the sunscreen loyalists might expect—and the answer depends a lot on who you are.

Do Sunscreen Chemicals Harm You?

Continue reading the full summary in the app — free to try.

Read Full Summary →

Free • No credit card required

Listen to Audio Summary Open in App

Never miss an episode of Science Vs

Get every new episode summarized in your inbox — free, ~5 minutes to read.

No spam. Unsubscribe anytime.

What you'll learn

1 (00:34) **The Big Question: Is Sunscreen Toxic?** - The host introduces the episode's central conflict: social media claims that sunscreen is toxic, causes cancer, and blocks vitamin D, versus the scientific evidence.
2 (03:06) **The Oxybenzone Rat Study: A Classic Red Flag** - The investigation begins by examining the most infamous study used to claim sunscreen is a dangerous hormone disruptor.
3 (09:38) **The FDA's "Maximum Usage" Trials: Are Chemicals in Our Blood?** - The show moves to human studies that found sunscreen chemicals do enter the bloodstream, a key point for online alarmists.
4 (12:22) **What About the Coral Reefs?** - The episode addresses the environmental concern that sunscreen is killing coral reefs, a claim that has led to bans in places like Hawaii.
5 (14:35) **Chemical vs. Mineral Sunscreens: What's the Real Difference?** - The show breaks down the two main types of sunscreen and explains which one might be better for those still worried about absorption.
6 (18:03) **The New Ingredient: Bemo Trisonol** - The show highlights a newly approved sunscreen ingredient in the US that offers a "best of both worlds" solution.
7 (23:47) **The Vitamin D Dilemma: Does Sunscreen Starve Your Body?** - The show pivots to the second major claim: that sunscreen blocks the UV rays needed to produce vitamin D.

+ Full timestamped outline available in the app

Show Notes

Sunscreen is supposed to protect us from dangerous stuff like cancer, but all over social media, people are saying that we’ve been getting it all wrong. We’re being told that our sunscreen is full of toxic chemicals, that wearing it could mess with our vitamin D levels — even that sunscreen itself actually increases our risk of skin cancer. So, what can the science tell us here? Should we toss our SPF-filled creams and sprays in the bin?? And could the answer here be different depending on your skin tone? We talk to researchers Dr. Brandon Adler, Prof. Rachel Neale, and Dr. Adewole Adamson to find out.

Find our transcript here: https://tinyurl.com/ScienceVsSunscreen

In this episode, we cover:

(00:00) The internet freak-out over sunscreen

(05:06) Is sunscreen toxic?

(20:46) Does sunscreen mess with vitamin D?

(29:29) Does sunscreen work to prevent skin cancer?

(34:40) Do people with darker skin need sunscreen?

(44:38) How to wear sunscreen correctly

This episode was produced by Michelle Dang, with help from Meryl Horn, Rose Rimler and Ekedi Fausther-Keeys. We’re edited by Blythe Terrell. Wendy Zukerman is our executive producer. Fact checking by Erica Akiko Howard. Video editing and sound by Bobby Lord. Music written by Bobby Lord, Bumi Hidaka, So Wylie, Emma Munger and Peter Leonard. Thanks to Humdinger Studios in Melbourne and Wolff Island Studios in New York City.

Science Vs is a Spotify Studios Original. Listen for free on Spotify or wherever you get your podcasts. You can also find us on YouTube, TikTok and Instagram.

Learn more about your ad choices. Visit podcastchoices.com/adchoices