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.
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
Health effects / Other evidence
Among those teens, product use in the previous day (including cosmetics, creams and perfume or deodorant) did not statistically explain the higher phthalate and paraben levels in the ADHD group, although the ADHD group used more cosmetics and washes.
Weak evidence: 24-hour self-reported use; small n; supplementary mediation tables not available; does not show that products are not a source of exposure in general.
Source: Terzioğlu 2026, Psychiatry Investigation Link to this fact
Health effects / Other evidence
In the same Turkish study, perfume was the smell that bothered migraine patients most (about 31%, 40 of 128), while in tension-type headache patients food smells came first (10.5%) and perfume third (5.8%).
Weak evidence: Small retrospective chart-based sample; one odor per patient apparently recorded; 'food' not broken down; says nothing about causing attacks.
Health effects / Other evidence
In a rat study, 30 days of breathing the vapor of one undiluted commercial perfume (5 mL on cotton in a closed box, 1 h/day) raised markers of oxidative stress (serum MDA 48.7 vs 32.3 nmol/L, lung MDA about 1.8-fold) and lowered antioxidant defenses in serum and lung versus untreated and olive-oil rats.
Weak evidence.
Caveats
Animal only; five male rats per group; one perfume; airborne concentration, box volume and ethanol content never measured; no empty-box or ethanol-vapor control, so confinement stress and solvent are not excluded; no exact p-values; heart and brain oxidative markers did not change.
Source: Al-Sowayan 2026, Frontiers in Pharmacology Link to this fact
Health effects / Other evidence
In the same rat study, perfume-exposed animals had higher blood pressure (130 vs 112 mmHg), heart rate (376 vs 352 bpm), cardiac troponin T (3.41 vs 2.06 ng/mL) and creatinine (0.99 vs 0.60 mg/dL) and lung and heart tissue changes on slides.
Weak evidence: Animal only, n = 5; single troponin and creatinine values with large SE; no empty-box or ethanol control; histology unscored; dose unknown relative to human use.
Source: Al-Sowayan 2026, Frontiers in Pharmacology Link to this fact
Health effects / Other evidence
The perfume rat study found no change in serum brain-injury markers (GFAP, UCH-L1) and no significant change in brain KLF4 expression; the brain claim rests on cortical gliosis on slides alone.
Weak evidence: The abstract says Klf4 was downregulated, but the results call it a non-significant trend; five rats per group; histology qualitative.
Source: Al-Sowayan 2026, Frontiers in Pharmacology Link to this fact
Information, not medical advice. See also: myths we won’t tell you.