Octocrylene is safe for sun protection at concentrations up to 10%—it doesn't disrupt your hormones like some worried it might. It's a rare skin sensitizer, though photocontact allergies (reactions triggered by sun + ingredient) happen more often, usually in people already sensitive to the pain reliever ketoprofen.

Researchers reviewed safety data from the European Chemical Agency and peer-reviewed scientific studies to assess octocrylene's effects on skin, hormones, and allergic reactions.

Funding not disclosed in abstract