Don’t take our word for it. Here’s every fact on this site, with its evidence grade, its caveats, and a link to the source, so you can check us.
We start you on the strong ones: findings that have been replicated or come from one large, well-controlled study. Moderate and weak facts are here too, labeled for what they are. Use “Link to this fact” to share a single card.
The industry / Other evidence
A fragrance fixative left on skin for hours in a lotion or perfume penetrates far more than the same chemical in a soap that is quickly rinsed off: an FDA lab's modeled estimate for musk xylol found roughly 50-60 times more absorbed mass from a 12-hour lotion application than from a 4-minute soap wash, at realistic in-use concentrations and body-surface areas.
Moderate evidence: Modeled, not directly measured for this scenario; the Kp was derived from more-permeable hairless guinea pig skin, which the authors themselves say overestimates human absorption.
Source: Hood 1996, Food and Chemical Toxicology Link to this fact
The industry / Measured in people or real products
Eau de Cologne is applied in far larger amounts per use than eau de toilette/perfume by both French men and women — roughly 1.8-4.3 g (mean) versus about a quarter gram, a 7- to 17-fold difference — reflecting the lower fragrance concentration and more liberal application of cologne-type products.
Moderate evidence: Small Eau de Cologne subgroups (n=11-17).
Source: Ficheux et al. 2016 (amount data), Food and Chemical Toxicology Link to this fact
Laws and loopholes / Lab study (cells or chemistry)
A finished perfume is usually not toxicity-tested as a whole; its safety is assessed on paper from its secret ingredient list. When researchers tested 42 whole perfumes directly, they found hazards that ingredient-by-ingredient assessment is not designed to catch.
Moderate evidence: EU framework described by the authors; the hazards are in vitro and unidentified.
Source: Morlock & Heil 2025, Journal of Chromatography A Link to this fact
Laws and loopholes / Measured in people or real products
Even though EU law requires 26 specific fragrance allergens to be named individually above 0.01% concentration, 60% of the 1,447 scented detergents in this German household study listed only the generic term 'perfume', 'fragrance', or 'aroma' rather than naming any specific allergen, and only 46% named any of the 26 at all.
Moderate evidence.
Caveats
Generic wording can be legal (allergen absent, below threshold, or arriving undeclared via a natural extract, which the rule exempts); this paper did not test which explanation applies in which product.
Source: Wieck 2018, Regulatory Toxicology and Pharmacology Link to this fact
Laws and loopholes / Government agency
The European Commission's own guidance on cosmetic 'free from' claims (agreed with industry in 2017) says a 'free from perfume' claim should not be used if the product contains any ingredient that exerts a perfuming function, regardless of that ingredient's other functions — wording that would exclude a masking fragrance, not permit one.
Moderate evidence.
Caveats
Non-binding guidance, not the regulation itself, and it never uses the words 'fragrance-free', 'unscented' or 'masking agent'; this is our reading of its 'free from perfume' wording, not a direct statement about masking.
Source: EC Technical Document on Cosmetic Claims 2017 Industry-funded Link to this fact
Laws and loopholes / Measured in people or real products
Deodorants marketed with words like 'sensitive', 'soft' or 'skin soothing' were not allergen-free: 95% still contained perfume and 15% contained a strong allergen above the labeling threshold.
Moderate evidence: N=102 of 308 products across the 2010-2011 samples; single-country, label-based.
Source: Klaschka 2012, International Journal of Hygiene and Environmental Health Link to this fact
Laws and loopholes / Review of other studies
Fewer than half (46.0%) of 63 reviewed fragrance-free policies included any supply-chain or procurement control over the cleaning, laundry, or air-freshening products the institution itself buys, even though named triggers in the companion focus-group study rank cleaning and laundry products alongside or above perfume.
Moderate evidence: Document analysis; does not establish that procurement control would reduce measured exposure, only that most policies do not attempt it.
Laws and loopholes / Government agency
In a 1993 letter of findings, the US Department of Justice determined that a public entity is not required to prohibit employees from wearing perfume or other scented products, because that would not be a "reasonable" modification to personnel policy under ADA title II.
Moderate evidence.
Caveats
A technical-assistance letter states DOJ's own enforcement position; it is not a regulation or court ruling and does not bind courts. Addresses title II public access only, not title I employment accommodation.
Source: DOJ Civil Rights Division 1993 (TAL 383) Link to this fact
Laws and loopholes / Other evidence
The Canadian Human Rights Commission's 2019 information sheet says a reaction to much lower levels of chemicals or perfumes than the average person tolerates "is a medical condition. It is a recognized disability."
Moderate evidence: Agency position stated without citation or test; a two-page information sheet, not a ruling. Says 'allergies or environmental sensitivity', never 'multiple chemical sensitivity'.
Source: [[src-2019-chrc-environmental-sensitivity-scent-free-policies|CHRC 2019]] Link to this fact
Skin allergy / Measured in people or real products
Standard allergy screening misses a large share of fragrance allergy: in one UK clinic 42% of patients allergic to at least one of the 26 EU-labeled fragrance chemicals tested negative on the standard fragrance markers, and about 4 in 10 people who reacted to their own perfume or deodorant were negative on the screen.
Moderate evidence.
Caveats
Comparator-dependent: Sukakul 2022 found ~10% missed when comparing fragrance mixes with their own ingredients (abstract-sourced). The Mann 2014 primary, now read in full (not just its abstract), confirms 203 patients reacted to any of the 26 EU fragrances and only 117 (57.6%) also reacted to a baseline marker = 42.4% missed; Mann's own Discussion states this as "40.6%" in one sentence, a small internal inconsistency in the primary (Results math gives 42.4%). More importantly, Mann's own paper reports a similarly-designed Danish study (Heisterberg 2011, n=1,508, also routine testing of all patients with the same 26 fragrances) that found only 15.6% missed — a ~2.5-fold discrepancy the authors attribute only partly to higher test concentrations and a different patient population, not fully resolved. The own-product figure (41%/45%) is from a different study (Uter 2007), not Mann.
Skin allergy / Measured in people or real products
Concentrations of hydroxycitronellal found in some 'natural' perfumes (up to 6.04%) exceeded the concentration shown to sensitize 36% of healthy volunteers in repeated-insult patch testing (5%), and were also well above the fragrance industry's own 1996 recommended maximum (equivalent to about 1% in the finished product).
Moderate evidence.
Caveats
Single-study 1996 patch-test-sensitization citations (Ford & Api 1988; Suskind 1992) for the 5%/36% figure, not independently verified in this evidence base; product concentration is not the same as measured consumer exposure dose.
Skin allergy / Other evidence
Fine fragrances (perfume, cologne) carry more contact-allergy risk per use than the same allergen amount spread over a larger, more dilute area, because sensitization risk depends on allergen dose per unit skin area, not total allergen delivered.
Moderate evidence: General dose-response principle from cited elicitation studies, not this review's own new experiment.
Source: Johansen 2003, Am J Clin Dermatol 4(11):789-798, American Journal of Clinical Dermatology Link to this fact
Skin allergy / Other evidence
The standard fragrance patch-test screen (fragrance mix I, fragrance mix II, balsam of Peru) misses a large share of true fragrance allergy: this review's own cited figures range from about 40% to 70% missed depending on the comparison, and "approximately half" of relevant reactions to perfumes, deodorants, and shaving lotions go undetected by baseline testing.
Moderate evidence.
Caveats
Different underlying comparators (26-fragrance panel vs hydroperoxides vs own products) give different miss rates; a specific percentage should always name what it was compared against.
Source: de Groot 2020, Dermatitis 31(1):13-35, Dermatitis® Link to this fact
Skin allergy / Other evidence
In a 4-year German patch-test study of 1,468 patients tested with their own deodorants and perfumes, 129 had positive reactions to a specific product, and 58 of them (45%) were missed by the standard fragrance-mix, balsam-of-Peru, and lyral patch tests.
Moderate evidence.
Caveats
Numbers relayed secondhand via this review, citing Uter et al.; the primary IVDK dataset is not yet in our evidence base, and the specific allergens responsible for the 58 missed reactions are not given.
Source: Martini 2020, Annales de Dermatologie et de Vénéréologie Link to this fact
Skin allergy / Other evidence
Among 442 Danish adults aged 28-30, only 0.7% tested positive to fragrance mix I, although 33.0% (293/889) said perfumed products had given them eczema.
Moderate evidence.
Caveats
Self-report is lifetime recall of any eczema from perfumed products; the patch panel was the narrow TRUE Test (no FM II, no own products, no day-7 reading), so the gap partly reflects test sensitivity and irritant reactions.
Source: Mortz 2013, British Journal of Dermatology Link to this fact
Skin allergy / Other evidence
The OEKO-TEX STANDARD 100 document says test samples with "a non-product typical odor (for example fragrance / perfume, mold)" are excluded from testing and cannot get the label.
Moderate evidence: A sensory screen on the submitted sample, not a chemical limit; no fragrance ingredient, allergen or ppm cap is named. Industry-run voluntary scheme.
Source: OEKO-TEX Standard 100 (2026) Industry-funded Link to this fact
Skin allergy / Measured in people or real products
In a Danish clinic study of about 1,000 consecutive eczema patients, 4.2% (21/498) reacted to the perfume of at least one of 9 popular lower-priced wash-off products and 3.2% (16/497) to at least one of 8 stay-on products, patch tested at 5% in petrolatum.
Moderate evidence: Clinic population, not general population; the two product groups were tested at different clinics, so they are not directly comparable; one manufacturer's perfumes.
Source: Johansen 1997, Contact Dermatitis Link to this fact
Skin allergy / Measured in people or real products
The standard fragrance mix detected 81.3% (13/16) of positive reactions to stay-on product perfumes but only 52.4% (11/21) of those to wash-off product perfumes, and balsam of Peru added just 1 case, so patients with suspected perfume allergy need their own products tested.
Moderate evidence.
Caveats
Two clinics, different patch-test systems (TRUE Test vs petrolatum); single-group study not independently replicated for these product types; 10% of Odense candidates declined, many FM positive.
Source: Johansen 1997, Contact Dermatitis Link to this fact
Skin allergy / Measured in people or real products
Only about 31% (13/42) of fragrance-mix-positive patients in one clinic and 73% (11/15) in the other reacted to any of the product perfumes, so a positive fragrance mix does not predict reaction to a given product.
Moderate evidence: Different clinics and products; authors do not know whether it reflects low reactivity at product concentrations or a different allergy type.
Source: Johansen 1997, Contact Dermatitis Link to this fact
Skin allergy / Measured in people or real products
Skin care products caused the most cosmetic reactions (26%), then non-color hair preparations (16%) and facial makeup (12%); perfumes, colognes and toilet waters were only 7%.
Moderate evidence: Selected referral series of contact dermatitis specialists, 1977-1980 (40 months); not general-population rates.
Source: Eiermann 1982, Journal of the American Academy of Dermatology Link to this fact
What you can do / Measured in people or real products
Perfume was the strongest single predictor of diethyl phthalate exposure, so skipping perfume and fragranced personal care products is the most obvious way to lower it.
Moderate evidence: Association only; not tested as an intervention.
Source: Parlett 2013, Journal of Exposure Science and Environmental Epidemiology Link to this fact
What you can do / Measured in people or real products
Musk levels in blood and milk seem to track current personal-care product use rather than lifetime storage: Hutter 2009 found that how often people used perfume and body lotion significantly predicted their blood levels of the polycyclic musks (galaxolide, tonalide) in 100 adults, so choosing fragrance-free personal care and laundry products during pregnancy and breastfeeding is a plausible way to lower a mother's musk levels and, in turn, transfer to the baby.
Moderate evidence.
Caveats
Route inferred in Reiner 2007 from the absence of an age trend in milk, and now supported by direct product-use data in two independent populations and matrices: Hutter 2009 (blood, non-pregnant Vienna adults) and Lignell 2008 (101 Swedish mothers, milk itself — the exact matrix this claim concerns). Lignell 2008 found perfume-use frequency predicted HHCB and perfumed-laundry-detergent use predicted AHTN in milk, but no product-use variable predicted musk xylene, matching Hutter's blood-based polycyclic/nitro split. Still correlational and cross-sectional; no study has measured milk musk levels before and after a change in a mother's product use, and no cosmetics-use variable has ever predicted a nitro musk in either study.
Source: Reiner 2007, Environmental Science & Technology Link to this fact
What you can do / Self-reported survey
Fragrance-free policies need to cover cleaning and laundry products, not just perfume: of 60 people who react to fragranced products, 50 named cleaning products, 47 perfume, and 41 laundry products as persistent triggers.
Moderate evidence: Self-selected Canadian sample (90% female); counts of participants naming a source, not exposure measurements.
Source: Roy 2026 Link to this fact
What you can do / Measured in people or real products
Ventilation and less ozone help: in the same test room, with lower ozone (25–30 ppb) and nearly 3× the air exchange, particle mass from perfume, hair spray, and body spray fell by more than half.
Moderate evidence: One supplementary run; ozone and ventilation changed together, so their separate effects are unknown.
Source: Wu 2024, Environmental Science & Technology Letters Link to this fact
What you can do / Self-reported survey
Fragrance-free health-care policies should cover cleaning and laundry products, not just staff perfume; Canadian advocates ask for exactly this, and people who react name cleaning products as their most common trigger (50 of 60).
Moderate evidence: Advocacy position plus a self-selected focus-group sample; no evidence yet that policies reduce exposure or symptoms.
What you can do / Measured in people or real products
How often someone used body lotion and perfume was directly linked to how much of the synthetic musks galaxolide and tonalide were in their blood, giving direct human evidence that switching to musk-free lotions and perfumes could lower blood levels of these fragrance chemicals.
Moderate evidence: Cross-sectional frequency-of-use questionnaire, not an intervention; the link was not shown for musk ketone or musk xylene, only for the polycyclic musks.
Source: Hutter 2009, Science of the Total Environment Link to this fact
What you can do / Self-reported survey
More than a third of people surveyed (37%) report avoiding at least one leave-on scented product (perfume, deodorant, skin cream) because it has caused them skin problems.
Moderate evidence.
Caveats
Self-reported avoidance, not a clinical diagnosis; nearly identical rates in the full interviewed sample (12,377) and the smaller patch-tested subsample (3,119), supporting representativeness.
Source: Diepgen 2015 (EDEN), British Journal of Dermatology Industry-funded Link to this fact
What you can do / Measured in people or real products
Because galaxolide (HHCB) levels in milk tracked perfume use and tonalide (AHTN) levels tracked scented-laundry-detergent use specifically, choosing fragrance-free perfume and fragrance-free laundry detergent during pregnancy and breastfeeding are each independently plausible ways to lower the corresponding musk chemical passed to a nursing infant.
Moderate evidence.
Caveats
Correlational and cross-sectional, no before/after intervention trial; musk xylene (a nitro musk) showed no association with any product category tested, so this action would not address that compound.
Source: Lignell 2008, Environmental Science & Technology Link to this fact
What you can do / Measured in people or real products
Read the ingredient list for the named allergens rather than trusting marketing words like 'sensitive' or 'soft' on a deodorant label; in one German sample, products carrying such words were no less likely to contain perfume or a strong allergen than the market as a whole.
Moderate evidence: Single-country label survey; does not establish the words are misleading everywhere, only in this sample.
Source: Klaschka 2012, International Journal of Hygiene and Environmental Health Link to this fact
What you can do / Measured in people or real products
Fabric type changes how much added perfume stays on clothes after washing: in a lab wash simulator, polyester retained more of a technical perfume accord than cotton after a full wash-and-rinse cycle, because cotton lost an average of about 70% of the perfume it picked up during the main wash over three rinses, versus only 40%-50% for polyester.
Moderate evidence.
Caveats
Industry (Procter & Gamble) lab study; coi/industry-funded despite the paper's own 'no conflict of interest' statement. Used a small-scale bench wash simulator, a model detergent, and a synthetic 22-component technical perfume accord, not a named commercial detergent or perfume. Measured fabric immediately after washing/rinsing only, not after days of storage or wear.
Source: Marcotullio 2025, Journal of Surfactants and Detergents Industry-funded Link to this fact
What you can do / Measured in people or real products
Washing cotton in cold water (20C) can deposit MORE, not less, of the more water-soluble perfume ingredients onto the fabric than a warmer 40C wash, because colder water pushes more hydrophilic perfume into surfactant micelles that then break and redeposit during rinsing; this effect was specific to cotton with detergent present and did not occur on polyester or on cotton without surfactant.
Moderate evidence: Coi/industry-funded (Procter & Gamble); one lab bench simulator, one detergent formula, one synthetic perfume accord; not tested on a named commercial cold-wash detergent.
Source: Marcotullio 2025, Journal of Surfactants and Detergents Industry-funded Link to this fact
What you can do / Review of other studies
When relying on a workplace, clinic, or school's fragrance-free policy, check whether it (1) defines what's covered beyond perfume, especially cleaning and laundry products, (2) sets a default fragrance-free expectation rather than a complaint-triggered one, (3) controls what cleaning/laundry products the institution buys, and (4) names a real consequence for non-compliance — a 2026 scoping review of 63 such policies found these structural features present in well under half of cases.
Moderate evidence: Based on a gray-literature document review of North American policies; individual policies may vary, and having these features on paper does not guarantee enforcement.
What you can do / Measured in people or real products
In this 1996 sample, 3 of 73 deodorants labeled "not perfumed" genuinely contained none of the 21 fragrance substances tested, on chemical analysis.
Moderate evidence: Very small sample (n=3) from one country/year snapshot; does not establish that "not perfumed"/"fragrance-free" labels are reliable in general or in other markets/years.
Source: Rastogi et al. 1998, Contact Dermatitis Link to this fact
What you can do / Review of other studies
Patch testing a patient's own perfume, deodorant, or shaving lotion, not only a standardized fragrance panel, has detected sensitizations (e.g. to jasmine absolute, ylang ylang oil, lyral) that the panel alone missed.
Moderate evidence.
Caveats
Relayed from North American (Belsito 2006) and German IVDK (Uter 2007) clinical series; useful practical guidance for allergic patients even though Brasch's own account is secondary.
Source: Brasch 2007, Current Opinion in Allergy and Clinical Immunology Link to this fact
What you can do / Government agency
After a 1993 ADA complaint over municipal-employee perfume use, San Francisco voluntarily adopted a policy requiring public meeting notices to ask attendees to refrain from wearing perfume or other scented products, to let people with environmental illness or multiple chemical sensitivity attend.
Moderate evidence: One city's voluntary accommodation, reported secondhand in DOJ's own letter; not evidence the policy was enforced or effective, and not a legal requirement.
Source: DOJ Civil Rights Division 1993 (TAL 383) Link to this fact
What you can do / Measured in people or real products
A single spray of perfume puts about a quarter gram of product on the skin (median 0.23 g per application), and a single hairspray application puts on about two grams from an aerosol can or three-and-a-half grams from a pump, based on a two-week diary-and-weighed-container study of regular users.
Moderate evidence.
Caveats
From a women-only sample of already-regular product users who were given the product free; the study's own authors say the design likely overestimates rather than underestimates use.
Source: Loretz 2006, Food and Chemical Toxicology Industry-funded Link to this fact
What you can do / Measured in people or real products
If you want an accurate sense of how strong your own perfume or home's ambient scent really is, ask someone who was not continuously exposed, since your own nose will have adapted specifically to that scent while remaining normally sensitive to everything else.
Moderate evidence.
Caveats
Based on an 8-person controlled study; the general mechanism (odorant-specific adaptation) is well replicated, but this specific framing is a reasonable extrapolation, not a tested intervention.
Source: Dalton & Wysocki 1996, Perception & Psychophysics Link to this fact
What you can do / Other evidence
Isoeugenol is a flavor ingredient (about 236 kg a year in the US) and also a classic fragrance allergen; the flavor panel's safety margin counts only eating it, not skin contact from deodorants or perfumes.
Moderate evidence: The article does not discuss fragrance exposure; 'allergen' status comes from other sources (Bruze 2005), not this page.
Source: Smith et al. 2009 (FEMA Expert Panel), GRAS Flavoring Substances 24, Food Technology 63(6), Food Technology Industry-funded Link to this fact
What you can do / Other evidence
Dermatitis patients who say a perfumed product has ever caused or worsened their rash had about double the odds (OR 2.16) of testing positive to a fragrance allergen, so such a history is a reason to ask for patch testing.
Moderate evidence: Self-report in a referred population; most 'yes' answers were not allergic (138 of 675).
Source: Bennike et al. 2019, Contact Dermatitis Link to this fact
What you can do / Measured in people or real products
Parabens are cosmetic and personal-care preservatives, not fragrance ingredients, so this child-behavior study provides no evidence about perfume or fragrance.
Moderate evidence: Paper measured only methyl-, ethyl- and propylparaben; no fragrance compounds, phthalates or MEP.
Children and pregnancy / Self-reported survey
In a US survey, boys and girls who used makeup or body products used fragrance products (perfume, cologne, body spray) at the same rate, about 31%.
Weak evidence.
Caveats
Scent-purpose products only; cleansers excluded, so not a fragrance-exposure prevalence. Indirect support for sex parity: in Melo 2020 (Brazil, 182/276 perfume users, 126 girls) at least 56/150 boys (≥37%) used perfume, so perfume is not a girls-only product; but the Brazilian level (66% of all children) is 3x the US level (≈21%), so the ~31% figure must not be generalized.
Source: Medley 2023 Link to this fact
Children and pregnancy / Self-reported survey
Children's lipstick, nail polish, and eyeshadow use was about the same in a Brazilian hospital survey and a US parent survey (roughly 19-22%, 22% and 11-13%), but perfume use was three times higher in Brazil (66% vs about 21%).
Weak evidence.
Caveats
Our cross-study arithmetic (Medley per-user rates re-based to all 312 children); different definitions ('perfume' vs 'fragrance products primarily for children'), ages (<=14 vs <=12) and sampling.
Source: Melo 2020, Revista Paulista de Pediatria Link to this fact
Children and pregnancy / Other evidence
In this cohort MEP, the urinary marker of the fragrance phthalate DEP, did not predict clinical-range behavior problems prenatally or postnatally (all 95% CIs include 1); it showed only uncorrected linear associations with ADHD-problems and pervasive-developmental-problems T-scores (coefficients 0.12-0.13), so the study gives no basis for a perfume-and-toddler-behavior claim.
Weak evidence: MEP is a product-use marker that cannot be separated from the fragrance mixture it travels with; one spot urine; the T-score signals are not corrected for 300 tests.
Source: Huang 2024, Toxics Link to this fact
Fragrance is everywhere / Review of other studies
A 2022 review of 37 studies found that phthalates, parabens, aldehydes, and aluminum salts are the contaminants most often reported in perfumes, colognes, and related scented products.
Weak evidence: Non-quantitative review with factual slips; cite primary studies for numbers.
Source: Kazemi 2022, Journal of Environmental Health Science and Engineering Link to this fact
Fragrance is everywhere / Measured in people or real products
The same perfume does not come off the skin the same way every day: in women not on the pill, a fixed dose of vanilla on the forearm was rated about 3 times stronger on cycle day 22 than during menstruation.
Weak evidence: 18 women (9 per group), 25 male raters, no hormone confirmation, no unperfumed control, no statistics printed, storage time unreported.
Source: Chróst 2021, Journal of Cosmetic Dermatology Link to this fact
Fragrance is everywhere / Review of other studies
Deodorants alone are estimated to deliver roughly 1,000 metric tons of fragrance per year to the German population, based on standard daily-dose, dermal-retention, and perfume-content assumptions.
Weak evidence: A calculated estimate from published dose and market-size figures, not a measured total; depends on assumed 1% dermal retention and 3-5% perfume content.
Source: Klaschka 2012, International Journal of Hygiene and Environmental Health Link to this fact
Fragrance is everywhere / Review of other studies
The review lists perfumes, hair sprays, soaps and nail varnishes as products that contain phthalates, but names no specific phthalate for those products and no musk, UV filter, paraben or terpene.
Weak evidence: One generic sentence; it supports no fragrance-specific neurotoxicity claim.
Source: Jocsak 2026, Frontiers in Behavioral Neuroscience Link to this fact
Fragrance is everywhere / Other evidence
In a 30-person Shanghai lab study, a floral-musk perfume blend from Shiseido (jasmine, musk, muguet, rose, bergamot and others) was linked to faster reaction times on a go/nogo button task after a 15-minute simulated drive (about 445 ms vs 484 ms with no scent).
Weak evidence.
Caveats
Small crossover, young adults, nobody drove (watched a video), participants could smell the scent so it was not blinded, odorless rather than placebo-odor control, no air concentration measured, scent supplier employed the first author, and stats treat paired data as independent.
Health effects / Review of other studies
A 2022 review concluded that links between contaminants in perfumes and cancer, breathing problems, and hormone disruption are 'probable' but still need research to prove.
Weak evidence: Evidence mostly from phthalate/paraben studies not perfume exposure.
Source: Kazemi 2022, Journal of Environmental Health Science and Engineering Link to this fact
Health effects / Lab study (cells or chemistry)
Many perfumes contain strongly antibacterial compounds: activity against Gram-negative bacteria appeared at 50 billionths of a liter, and a single spray is about 2,000 times that amount.
Weak evidence: Plate assay with a marine bacterium; effect on the skin microbiome inferred by the authors, not tested.
Source: Morlock & Heil 2025, Journal of Chromatography A Link to this fact
Health effects / Measured in people or real products
In the same test, patients rated breathlessness and cough higher after perfume at the eyes (1.5 vs 0.4 and 0.9 vs 0.3 on a 0-3 scale), yet lung function, oxygen saturation, and breathing rate did not change at all.
Weak evidence: Single-blind (scorers apparently not blinded), 3 of many symptoms analyzed, n=11; the airway symptoms did not replicate double-blind (Elberling 2006: 6/11 perfume vs 5/11 placebo).
Health effects / Lab study (cells or chemistry)
A small 2026 follow-up study found mutagenic and cell-killing compounds in 8 perfumes, consistent with an earlier 42-perfume finding from the same German lab.
Weak evidence.
Caveats
Same lab and platform as the earlier study, not independent; only 8 unnamed perfumes, unclear overlap with the 42; simulated liver metabolism was built for this paper but explicitly not tested on the perfumes; no antibacterial or hormone-related endpoints were run.
Source: Schmidtmann 2026, Analytical Chemistry Link to this fact
Health effects / Review of other studies
Benzyl salicylate, BHT, and butylphenyl methylpropional, all found in the tested perfumes, have been shown in other cited research to interfere with estrogenic signaling pathways and may therefore increase breast cancer risk.
Weak evidence: No doses or a quantified risk estimate are given; this is a mechanistic association from cited literature, not a measured increase in breast cancer risk from perfume use.
Source: Tegengif 2022 Link to this fact
Health effects / Animal study
In rats, daily skin application of six commercial perfumes (three original, three counterfeit) for 28 days significantly increased mast cell counts in the liver and in several lung compartments (perivascular, peribronchial, pleural) compared to untreated controls, with no allergic or inflammatory tissue damage seen on routine histology.
Weak evidence.
Caveats
Single animal study (n=12/group Wistar rats), not replicated; effects were inconsistent across the two special stains used and not every perfume produced a statistically distinguished result in every tissue; perfumes were not chemically characterized.
Source: Hananeh 2021, Open Veterinary Journal Link to this fact
Health effects / Animal study
Neither original nor counterfeit perfume increased mast cell numbers in rat skin (the site of direct application) or the heart after 28 days of daily use, the systemic organs (liver, lungs) responded, not the local application site.
Weak evidence.
Caveats
Counterintuitive given topical exposure; the study did not investigate a mechanism (e.g., systemic absorption vs. distant mast cell recruitment) for why the application site itself was unaffected.
Source: Hananeh 2021, Open Veterinary Journal Link to this fact
Health effects / Animal study
The counterfeit perfume F3 produced the largest single effect in this rat study (liver mast cells rose about 13-fold over control, from about 25 to about 319 cells/mm2 by toluidine blue stain), but the other two counterfeit perfumes tested (F1, F2) did not clearly exceed their genuine counterparts on most measures.
Weak evidence.
Caveats
Only 3 counterfeit/genuine pairs tested, purchased from local markets with no independent authentication or chemical fingerprinting of counterfeit status; not a general fake-vs-genuine comparison.
Source: Hananeh 2021, Open Veterinary Journal Link to this fact
Health effects / Other evidence
In this clinic sample, perfume/odor was a trigger at similar rates in men and women (Table 1, p=0.903) even though the paper's text says women had more perfume/odor triggers; the table and text disagree.
Weak evidence: Only 143 to 145 men; the paper's own text and table conflict, so neither direction is firm.
Source: Kelman 2007, Cephalalgia, Cephalalgia Link to this fact
Health effects / Other evidence
In a small Swedish clinic sample of 60 women with migraine, 63% (38/60) named odors as a migraine trigger, and 87% of those (33/38) named perfume, followed by car exhaust (45%) and cigarette smoke (42%).
Weak evidence.
Caveats
Recruited specifically to find odor-triggered migraine and told the study was about olfaction, so prevalence is an upper bound (worst case 38/95 = 40%); self-report, no controls, no exposure measurement; does not show perfume causes migraine.
Source: Sjöstrand 2010, Curr Pain Headache Rep, Current Pain and Headache Reports Link to this fact
Health effects / Other evidence
Most everyday odorants, including those in perfumes, stimulate both the smell nerves and the trigeminal ('nasal pain') nerves, and the study's authors propose that in migraine with aura the smell component is poorly integrated while trigeminal processing is exaggerated.
Weak evidence: A hypothesis, not a tested result; no fragrance product or fragrance chemical was used and no odor-triggered attacks were recorded.
Source: Mignot et al. 2023, J Headache Pain, The Journal of Headache and Pain Industry-funded Link to this fact
Health effects / Other evidence
In this mixture analysis the phthalate metabolite MEP, a marker of diethyl phthalate exposure, was a minor and sex-inconsistent contributor (positive weight 0.08 in boys, negative 0.17 in girls for working memory), so the study gives no support to a perfume-specific effect on child behavior.
Weak evidence: MEP also marks fragranced-product use; weights are unstable and the study did not test fragrance directly.
Source: Puvvula 2026, Environ Int, Environment International Link to this fact
Information, not medical advice. See also: myths we won’t tell you.