At a glance
| Chemical family | Organic UV filter — benzophenone derivative (benzophenone-3); a personal-care / cosmetic ingredient |
| CAS number | 131-57-7 |
| Classification | Not assigned an IARC carcinogen classification; regulated as a sunscreen active by the FDA (additional safety data requested); endocrine-active in laboratory studies; restricted or banned in several jurisdictions for coral-reef toxicity |
| Where you encounter it | Chemical sunscreens, daily SPF moisturizers, some foundations, lip balms and lipsticks, hair products, and fragrances (as a UV stabilizer) |
| Sleep micro-environment relevance | A leave-on compound applied to skin that remains in contact with bedding overnight; the absorbed fraction is excreted partly via sweat and sebum onto the sleep surface — a direct personal-care-residue pathway |
| Activated carbon capture | High — a lipophilic aromatic of moderate molecular weight (228) that adsorbs well onto activated carbon |
What it is
Oxybenzone is an aromatic ketone — two benzene rings joined by a carbonyl, with hydroxyl and methoxy substituents — that absorbs ultraviolet light, which is why it is used as a broad-spectrum UV filter. It has been one of the workhorse organic sunscreen ingredients for decades and appears well beyond sunscreen: in moisturizers with SPF, in colour cosmetics, and as a UV stabilizer that protects the product itself from light degradation.
Its defining property, from an exposure standpoint, is that it does not stay on the surface of the skin. In a randomized clinical trial conducted by the FDA and published in JAMA in 2020, oxybenzone applied under maximal-use sunscreen conditions reached peak plasma concentrations of roughly 200 ng/mL, and blood levels exceeded the FDA's 0.5 ng/mL threshold — the level above which the agency asks for additional toxicology testing — after the first day of use. Peer-reviewed — Matta et al. 2020, JAMA Of the common organic filters tested, oxybenzone was the most systemically absorbed.
That absorption is reflected in population biomonitoring: the CDC's national exposure reports have detected oxybenzone in the urine of around 97% of the people sampled, making it one of the most widely detected personal-care chemicals in the population. Regulatory — CDC biomonitoring
How it gets to the bedroom
Applied to skin, then pressed against bedding
The core pathway is simple. Oxybenzone is a leave-on product applied directly to skin, and skin spends seven to nine hours in close contact with sheets and pillowcases. Residue on the skin surface transfers onto textiles by direct contact and abrasion, the same way other skin-applied compounds deposit onto bedding. For someone who applies a daily SPF moisturizer or sunscreen, that residue is renewed each day. Inferred — skin-to-textile transfer is well-established for skin-applied compounds; oxybenzone-specific bedding deposition has not been separately quantified
Absorbed, circulated, and excreted onto the skin surface
Because a meaningful fraction is absorbed into the bloodstream (the JAMA finding), oxybenzone is also excreted — partly through sweat and sebum, which carry compounds back to the skin surface overnight, when the body is warm and occluded against bedding. Peer-reviewed — systemic absorption, Matta 2020 This is the same dietary-and-personal-care-to-sweat-to-bedding logic that underlies much of the Atlas: a compound on or in the body becomes a compound on the sleep surface.
From cosmetics and fragrance, not just sunscreen
Oxybenzone is easy to overlook because people associate it only with beach sunscreen. In practice, it appears in year-round products applied before bed or left on overnight — moisturizers, foundations, lip products, and as a UV stabilizer in fragrances. These low-level, daily, leave-on exposures are more relevant to the bedroom than occasional heavy sunscreen use.
What the research says
Systemic absorption and persistence
The strongest, clearest finding is the FDA absorption trial: oxybenzone crosses skin into blood at concentrations well above the agency's testing threshold, and remains detectable in plasma for days after application stops. Peer-reviewed — Matta 2020 Combined with near-universal population detection, this establishes that exposure is real, common, and ongoing — which is a different question from whether it causes harm at these levels.
Endocrine activity
Oxybenzone shows endocrine activity in laboratory studies — estrogenic and anti-androgenic effects have been reported — and this hormonal activity is the basis of much of the scientific and regulatory scrutiny. Peer-reviewed — DiNardo & Downs 2018 The significance for human health at typical exposure levels remains debated; the honest summary is that the absorption and hormonal activity are documented, while the real-world dose-response in people is not settled.
Environmental and regulatory context
Hawaii's Act 104 (2018) and similar measures elsewhere banned the sale of sunscreens containing oxybenzone and octinoxate, citing harm to coral reefs. Regulatory — Hawaii Act 104 The FDA, in its sunscreen rulemaking, placed oxybenzone among the active ingredients for which it requested additional safety data rather than affirming it as generally recognized as safe and effective. Regulatory — FDA Neither action is a cancer classification; both reflect a precautionary posture given absorption and biological activity.
What helps reduce exposure
Choose mineral (zinc oxide / titanium dioxide) sunscreens. Mineral UV filters sit on the skin surface and are not absorbed systemically the way oxybenzone is. This is the single highest-impact swap for someone who uses sunscreen daily.
Check leave-on products, not just sunscreen. Read labels on daily moisturizers, foundations, and lip products for benzophenone-3 / oxybenzone, since the year-round low-level exposures matter more for the bedroom than occasional beach use.
Wash before bed if you have applied it during the day. Removing skin-surface residue before lying down reduces what transfers onto bedding overnight.
Launder bedding regularly. Routine washing removes accumulated skin-applied residues from sheets and pillowcases.
Activated-carbon filtration adsorbs oxybenzone well as a lipophilic aromatic, as part of the broader approach to skin-derived compounds at the sleep surface.
What does NOT help
- Assuming "for sensitive skin" or "dermatologist tested" means oxybenzone-free. These claims are unrelated; check the active-ingredient list.
- Relying on rinse-off timing alone. Because a fraction is absorbed systemically, washing reduces surface residue but does not remove the circulating body burden.
- HEPA-only air purifiers. Oxybenzone deposits on surfaces and skin; particle air filtration does not address the contact pathway.
Open research questions
- How much oxybenzone deposits onto bedding from daily leave-on use, and how that compares with the systemic-excretion contribution. Speculation
- Whether overnight skin contact with oxybenzone-laden bedding meaningfully adds to total daily dose. Speculation
- The human health significance of chronic low-level oxybenzone exposure given its endocrine activity. Speculation
Citations
- Matta MK, et al. (2020). Effect of Sunscreen Application Under Maximal Use Conditions on Plasma Concentration of Sunscreen Active Ingredients: A Randomized Clinical Trial. JAMA 323(3):256-267. JAMA Peer-reviewed
- DiNardo JC, Downs CA (2018). Dermatological and environmental toxicological impact of the sunscreen ingredient oxybenzone/benzophenone-3. Journal of Cosmetic Dermatology. PMID 29086472 Peer-reviewed
- CDC. Fourth National Report on Human Exposure to Environmental Chemicals — Benzophenone-3 (oxybenzone). Regulatory
- FDA. Sunscreen Drug Products for Over-the-Counter Human Use — request for additional safety data on oxybenzone. Regulatory
- State of Hawaii. Act 104 (2018) — prohibition on sale of oxybenzone/octinoxate sunscreens (reef protection). Regulatory
Frequently asked questions
Is oxybenzone absorbed through the skin?
Yes — substantially. In an FDA-conducted randomized trial published in JAMA in 2020, oxybenzone applied under maximal-use sunscreen conditions reached peak blood plasma concentrations around 200 ng/mL, and systemic levels exceeded the FDA's 0.5 ng/mL toxicology-testing threshold after the first day of use. Oxybenzone is the most systemically absorbed of the common organic sunscreen filters tested. Peer-reviewed
Why does oxybenzone matter for the bedroom?
Oxybenzone is a leave-on compound applied directly to skin — in sunscreen and in some daily moisturizers, cosmetics, and lip products. Skin is in close contact with bedding for seven to nine hours a night, so residue on skin transfers onto sheets and pillowcases, and the fraction absorbed systemically is excreted partly through sweat and sebum. It is a clear example of the personal-care-to-bedding pathway.
Is oxybenzone an endocrine disruptor?
Oxybenzone has measurable endocrine activity in laboratory studies, including estrogenic and anti-androgenic effects, which is the basis of much of the regulatory and scientific scrutiny. The human health significance at typical exposure levels is still debated, but the combination of confirmed systemic absorption, near-universal population detection, and hormonal activity is why it is treated as a compound of concern.
Why is oxybenzone banned in some places?
Hawaii (Act 104, 2018) and several other jurisdictions have prohibited the sale of sunscreens containing oxybenzone and octinoxate because of evidence that they contribute to coral reef damage. These bans are driven primarily by environmental (reef) toxicity rather than a specific human-cancer classification.
How long does oxybenzone stay in the body?
Oxybenzone is detected in the urine of nearly the entire sampled US population, indicating widespread, ongoing exposure, and the FDA absorption study found it still measurable in plasma days after application stopped. It persists in skin and is cleared slowly relative to a single application, so daily users carry a relatively steady body burden.
Related compounds
Embr is a sleep environment company researching and addressing the chemistry of the bedroom. Research and product development in progress.
Last reviewed 2026-06-26. If you find a factual error, contact us.