Is it safe for pregnant women to use sunscreen with benzophenone-3 (oxybenzone)?
No. Benzophenone exposure tracks with thyroid disruption in kids at urinary levels seen in pregnancy.
What's actually in it
Oxybenzone (benzophenone-3) is a chemical UV filter in many drugstore sunscreens, lip balms, and foundations. It absorbs UV by chemistry, then releases the energy. A significant fraction absorbs through skin into blood within hours of application. During pregnancy, benzophenones cross the placenta. After birth, they show up in breast milk.
Kids' sunscreens often still contain oxybenzone, which is a separate problem.
What the research says
A 2026 study in Environ Pollut ran urinary metabolomics in children and connected benzophenone exposure to thyroid function. Higher benzophenone biomarkers tracked with lower free T4 and altered thyroid hormone metabolism. Repeated measures made the association stronger: the effect was dose-dependent and chronic.
Thyroid hormone during pregnancy and early childhood is essential for brain development. A safer sunscreen is mineral-based with zinc oxide or titanium dioxide (non-nano versions). These sit on top of skin instead of absorbing. Brands like Babyganics, Thinksport, Badger, and All Good offer mineral-only formulas. Check labels for the full active ingredient list, not just the "mineral" front label. A wide-brimmed hat, UPF clothing, and shade handle most of the sun protection job.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Urinary metabolomics reveals associations between benzophenone exposure and thyroid function in children: A repeated-measures study. | Environ Pollut | 2026 |
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