Is benzophenone in sunscreen safe for babies?

What's actually in it

Benzophenone UV filters (BP-3, oxybenzone, and related compounds) absorb UV light. They're used in sunscreens, lip balms, and some personal care products to protect against UV damage. They also appear in some plastic packaging as UV stabilizers and can transfer to food or skin from contact.

The problem: benzophenones absorb through skin into the bloodstream quickly. Studies detect them in urine within hours of application. They behave like hormones once inside the body.

What the research says

A 2026 study in Environ Pollut used urine metabolomics to trace what happens after benzophenone exposure. They found associations between benzophenone exposure and thyroid hormone disruption. The thyroid regulates metabolism, growth, and brain development. In infants and toddlers, thyroid function is especially critical for normal development.

For sun protection on babies, mineral sunscreens using zinc oxide or titanium dioxide don't absorb through skin the way benzophenones do. The particles sit on the surface and reflect UV instead of absorbing it.

Check ingredient labels for oxybenzone, benzophenone-3, benzophenone-4, and BP-3. For baby clothing that provides UV protection without chemicals, see organic cotton baby gear.