Octocrylene, Explained: What the EU's 10 Percent Opinion and the FDA's Proposed Order Say, and How Benzophenone Builds Up in Aging Sunscreen
Octocrylene is an active ingredient in many sunscreens, yet people rarely ask about it by name. Two official documents from 2021 shape the discussion: a European safety opinion that set concentration limits, and a US proposed order that called the evidence inadequate. This guide covers what each says.
What octocrylene does in a sunscreen
Octocrylene is an organic (chemical) UV filter that absorbs UVB and short-wave UVA. The SCCS notes it is often used together with dibenzoylmethane derivatives such as avobenzone to stabilise them, and the FDA's proposed order also describes it as a possible photostabilizer.
What the European safety opinion set
The EU's Scientific Committee on Consumer Safety adopted its final opinion (SCCS/1627/21) on 30-31 March 2021. It found octocrylene safe as a UV filter up to 10 percent when used individually, including combined use with face cream, hand cream and lipstick. For a propellant (aerosol) spray used alongside those products, it said the concentration should not exceed 9 percent.
What the US proposed order says
On 24 September 2021 the FDA issued proposed order OTC000008. It lists octocrylene among ten ingredients with the most significant data gaps and proposes that sunscreens containing it are not generally recognized as safe and effective, because the evidence is inadequate rather than because harm was shown. A proposal is not a ban, so check the FDA sunscreen page for the current status before treating it as final.
The benzophenone question
The SCCS states that octocrylene generates benzophenone through a retro-aldol reaction, that benzophenone was found even in the raw ingredient, and that it is a hazardous impurity and degradation product to be kept at trace levels. Downs and colleagues (Chemical Research in Toxicology, 2021) measured 16 octocrylene-containing product lines: 39 mg/kg on average (6 to 186 mg/kg) when recently purchased, and 75 mg/kg on average (9.8 to 435 mg/kg) after an accelerated-stability test. Age and heat matter, so avoid old bottles that sat in a hot car.
Hormone-effect concerns, in proportion
The SCCS wrote that some in vivo studies suggest possible endocrine effects, but the evidence was not conclusive enough to set a threshold. The FDA called the hormonal findings preliminary. Both describe data gaps, not a demonstrated effect in people.
Allergy and photoallergy
In a European multicentre photopatch study of 1,031 patients with suspected photoallergy, 0.7 percent reacted to 10 percent octocrylene. The SCCS links it strongly to earlier photoallergy to topical ketoprofen (27 to 80 percent of those patients co-reacted) and calls it rare in the general population.
How to check your own bottle
Look for "octocrylene" in the active ingredient panel, but labels give no percentage. Mineral-only sunscreens use zinc oxide or titanium dioxide instead, a trade-off covered in our zinc oxide versus organic filters guide. If you use aerosols, read the spray sunscreen guide first.
Short version
Octocrylene has a European 10 percent safety opinion with a 9 percent propellant-spray note, and a US proposal that finds the data insufficient. Test any new sunscreen with our patch-test method, and if you react, see irritant versus allergic contact dermatitis before blaming one ingredient. This article is educational, not medical advice: patch-test any new product on a small area first, and consult a dermatologist about persistent skin problems or a suspected allergy.
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