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.
Children and pregnancy / Measured in people or real products
Synthetic musk fragrance chemicals were found in the breast milk of every one of 39 Massachusetts mothers tested in 2004; the most common, galaxolide (HHCB), was in 97% of them.
Strong evidence: One US state, 2004 samples, n=39; no product-use data; no health outcome.
Source: Reiner 2007, Environmental Science & Technology Link to this fact
Children and pregnancy / Measured in people or real products
Musk scent chemicals used in perfumes, deodorants, and detergents turn up in mothers' milk fat; a breastfed baby takes in an estimated ~2 micrograms of galaxolide a day.
Strong evidence.
Caveats
Intake is a model estimate from means of detects; the printed intakes do not reproduce from the stated method. Independently corroborated: Lignell 2008 (N=101, Swedish mothers, single lab) estimated median infant HHCB intake at 1650 ng/day (range 50-6950) using the same milk-intake modeling approach, closely matching this paper's printed 1830 ng/day figure in an unrelated country and cohort.
Source: Reiner 2007, Environmental Science & Technology Link to this fact
Fragrance is everywhere / Measured in people or real products
In blood tests of 100 healthy young adults in Vienna, the synthetic musk galaxolide was found in 91% of samples and musk xylene in 79%; only 7 of the 100 people had no synthetic musks in their blood at all.
Strong evidence: Cross-sectional, healthy university students in one city; no health outcome measured.
Source: Hutter 2009, Science of the Total Environment Link to this fact
Fragrance is everywhere / Measured in people or real products
Musk fragrance chemicals were found in the breast milk of all 101 Swedish first-time mothers tested; the musk chemical galaxolide (HHCB) was detected in every single sample across a seven-year span (1996-2003).
Strong evidence: One Swedish county, single lab/method, N=101; no infant health outcome measured.
Source: Lignell 2008, Environmental Science & Technology Link to this fact
Health effects / Animal study
Some older fragrance ingredients were neurotoxic: the nitromusk musk ambrette caused nerve damage in animal studies and was later withdrawn.
Strong evidence.
Caveats
Primary now read directly: Spencer 1984 is a large (N=220), dose-ranging, dual-route (dietary+dermal), histopathologically confirmed (light+EM) study showing clear dose-response demyelination and distal axonal degeneration. Note: musk ambrette's actual withdrawal from skin-contact products was driven primarily by a separate photoallergy finding (Cronin 1984), not directly by this neurotoxicity data, which RIFM had already argued had an adequate safety margin (>600) via absorption data (Ford 1994). Doses producing consistent neurotoxic effects are 50-250x the industry's own estimated maximum human exposure.
Source: Curtis 2004 (citing Spencer 1984), Environmental Health Perspectives Link to this fact
Health effects / Animal study
Musk ambrette, once a widely used musk fixative in fragrances (over 100,000 lb/year in the US since the 1920s), caused nerve-fiber demyelination and degeneration in a large industry-funded rat study of 220 animals, with hindlimb weakness ranging from isolated cases at moderate doses to complete weakness at the highest dose tested.
Strong evidence.
Caveats
Large (N=220), dose-ranging, dual-route (dietary+dermal) primary with clear dose-response and light+EM histopathology confirmation; doses producing consistent effects are 50-250x the industry's own estimated maximum human exposure.
Source: Spencer 1984, Toxicology and Applied Pharmacology Industry-funded Link to this fact
Laws and loopholes / Government agency
New Zealand's cosmetics Schedule 5 names the EU's classic 26 fragrance allergens individually, by CAS number, with the same 0.001% (leave-on) / 0.01% (rinse-off) disclosure thresholds the EU uses — but a New Zealand-specific override note then explicitly permits every one of those named substances (plus benzyl alcohol and two restricted musks) to be declared on the label only generically, as "fragrance" or "parfum," instead of by name.
Strong evidence.
Caveats
Verified by reading the full Schedule 5 table and its override note directly in this consolidated (pre-1-January-2026) text. The current (post-2026) version has now been read (src-2026-nz-epa-cosmetic-products-group-standard-consolidated-current): it retains Schedule 5's named-allergen list at the same thresholds (24 of the original 26 entries) but has revoked the override clause this claim describes (Sch. 1, condition 1(6), now "[Revoked]"), with no replacement found. This claim accurately describes the pre-2026 text only; see the current-text page and C355's extension for the current status.
Source: Cosmetic Products Group Standard 2020 (NZ, HSR002552, consolidated to 2025) Link to this fact
Children and pregnancy / Review of other studies
Synthetic musks reach mothers and babies mainly through the skin (cosmetics and clothes washed in scented detergent), not through food.
Moderate evidence.
Caveats
Inferred from absence in sea fish and no nursing-duration effect in newborns' fat; Reiner 2007 reaches the same conclusion. Hutter 2009 (100 Vienna adults, blood + cosmetics-use questionnaire) found cosmetics-use frequency significantly predicted only polycyclic-musk (galaxolide, tonalide) blood levels, not nitro-musk (musk ketone, musk xylene) levels. Lignell 2008 (101 Swedish mothers, milk) replicates this exact split in the matrix that actually reaches the infant: perfume use predicted HHCB, perfumed-laundry-detergent use predicted AHTN, but no product-use variable predicted musk xylene. No study has directly tested a dietary/food route for any musk in any of these populations, so 'not through food' remains an inference from the absence of nitro musks in sea fish (Schmeiser 2001), not a measured food-vs-skin comparison.
Source: Schmeiser 2001, International Journal of Hygiene and Environmental Health Link to this fact
Children and pregnancy / Measured in people or real products
In 101 Swedish first-time mothers tested over seven years, women who used perfume once a week or more had significantly higher levels of the musk chemical galaxolide (HHCB) in their breast milk than women who used it less often.
Moderate evidence: Product-use data from a N=44 subset; cross-sectional association, not an intervention; adjusted for sampling year.
Source: Lignell 2008, Environmental Science & Technology Link to this fact
Children and pregnancy / Measured in people or real products
Mothers who used perfumed laundry detergent had significantly higher levels of the musk chemical tonalide (AHTN) in their breast milk than mothers who used unscented detergent.
Moderate evidence: Product-use data from a N=44 subset; cross-sectional association, not an intervention; adjusted for sampling year.
Source: Lignell 2008, Environmental Science & Technology Link to this fact
Children and pregnancy / Measured in people or real products
In 20 Korean mothers, the synthetic musk fragrance chemical galaxolide (HHCB) was found in 70% of umbilical cord blood samples, often at levels higher than in the mother's own blood, pointing to the placenta, not just breast milk, as a route by which fragrance musks reach a baby.
Moderate evidence.
Caveats
Single Korean cohort, n=20 cord sera (17 complete mother-infant-milk triads); the authors call it a preliminary study. No product-use data collected, so the exposure source (cosmetics, laundry, etc.) is inferred, not measured. The paper's own text and its own table/summary numbers disagree on whether maternal or cord serum is higher, though both clearly exceed breast milk.
Children and pregnancy / Measured in people or real products
Musk-ketone was found more often than musk-xylene in Korean mothers' breast milk (65% vs. 53%), the same pattern seen in US mothers' milk and the opposite of the pattern seen in Swedish and German mothers' milk.
Moderate evidence: Small sample (n=17 breast milk); the US/Europe regional-pattern explanation is the interpretation of the Swedish authors (Lignell 2008), not directly tested by this paper.
Children and pregnancy / Measured in people or real products
In 42 Chinese mother-infant pairs, synthetic musk fragrance chemicals (especially galaxolide/HHCB) were found in 95% of 126 paired maternal blood, umbilical cord blood, and breast milk samples.
Moderate evidence.
Caveats
One city (Shanghai), 2007 samples, n=42 pairs; no product-use data; no health outcome; detection rates in blood were much lower (12-18 of 42) than in milk (41/42), limiting precision for the blood matrices.
Source: Zhang 2015, International Journal of Hygiene and Environmental Health Link to this fact
Children and pregnancy / Measured in people or real products
Musk fragrance levels in a newborn's own umbilical cord blood were higher than in the mother's blood, showing these scent chemicals cross the placenta before birth and can accumulate more in the fetus than in the mother.
Moderate evidence.
Caveats
Median total musk (ng/g lipid weight): cord serum 87.3 vs maternal serum 71.2 in this 42-pair Shanghai cohort; independently matches the direction (not the magnitude) found in a separate 20-pair South Korean cohort (Kang 2010), though Kang 2010's own paper is internally inconsistent about this direction in its prose vs its own tables.
Source: Zhang 2015, International Journal of Hygiene and Environmental Health Link to this fact
Children and pregnancy / Measured in people or real products
The ratio of a common fragrance musk chemical (HHCB/galaxolide) in cord blood versus the mother's blood was consistently and significantly above 1, which does not match what simple passive diffusion across the placenta would predict, hinting at an active or facilitated transfer process that is not yet understood.
Moderate evidence.
Caveats
Based on 17-40 valid paired samples (after excluding non-detects and statistical outliers) from one 42-pair Shanghai cohort; no transporter or protein-binding mechanism was directly tested; the authors call their own suggestion preliminary.
Source: Zhang 2015, International Journal of Hygiene and Environmental Health Link to this fact
Fragrance is everywhere / Review of other studies
Musk ketone, a synthetic musk used mainly in cosmetics, was found in the body fat of every German tested in the 1990s and in breast milk at up to 240 µg per kg of milk fat.
Moderate evidence.
Caveats
Secondary report of German surveys (391 Bavarian milk samples, mean 40 µg/kg fat, plus a smaller n=5 cohort at 11 µg/kg fat); 1990s data. Rimkus & Wolf 1996 (the primary source of that n=5 cohort) directly confirms musk ketone detection in all 19 of their own German fat/milk samples (1993/1995), but their own milk values (5-30 µg/kg fat, mean 11) are far below the oft-quoted 240 µg/kg maximum from the separate, larger Bavarian survey – do not imply 240 is a typical value.
Source: Schmeiser 2001, International Journal of Hygiene and Environmental Health Link to this fact
Fragrance is everywhere / Measured in people or real products
An older nitro musk (musk ketone), after European industry had moved away from nitro musks, was still in 85% of US mothers' milk in 2004.
Moderate evidence: N=39, Massachusetts only.
Source: Reiner 2007, Environmental Science & Technology Link to this fact
Fragrance is everywhere / Review of other studies
About 60% of the fragrance used in homes goes down the drain into rivers and lakes, and wastewater treatment removes little of it; polycyclic musks such as galaxolide turn up in rivers, lake air, mussels, and human milk.
Moderate evidence.
Caveats
The 60% figure is from older industry/secondary sources (Bickers 2003, Bridges 2002). The human-milk sub-claim is now supported by three independent primary studies spanning three countries: Rimkus & Wolf 1996 (Germany, n=5, 1993/1995), Reiner 2007 (US, n=39, 2004), and Lignell 2008 (Sweden, n=101, 1996-2003); cite these primaries for milk levels, not this review.
Source: Khalid & Abdollahi 2021, Iranian Journal of Pharmaceutical Research Link to this fact
Fragrance is everywhere / Measured in people or real products
As early as the mid-1990s, the musk fragrance chemicals galaxolide (HHCB) and tonalide (AHTN) were already detectable in the body fat and breast milk of every German person tested, 19 out of 19 samples.
Moderate evidence: Small sample (14 adipose + 5 milk, one German region, 1993/1995); no product-use data or health outcome measured.
Fragrance is everywhere / Measured in people or real products
Even at musk levels roughly an order of magnitude below US, South Korean, and Danish cohorts, synthetic musk fragrance chemicals were still detected in 95% of blood, cord-blood, and breast-milk samples from 42 Shanghai mothers and their newborns.
Moderate evidence.
Caveats
Shanghai musk levels were roughly an order of magnitude lower than comparable US, South Korean or Danish cohorts, reflecting lower musk-containing product use in China in 2007; no product-use data were actually collected in this study to confirm the cause.
Source: Zhang 2015, International Journal of Hygiene and Environmental Health Link to this fact
Health effects / Animal study
Two fragrance musks, AETT and musk ambrette, damaged the nervous system of rats in industry-sponsored studies and were withdrawn; musk ambrette was also barred from skin products because it caused allergic reactions in sunlight.
Moderate evidence.
Caveats
Both primaries now read directly: Spencer 1979 (AETT) is a small, single-lab, single-route dietary study (N=16); Spencer 1984 (musk ambrette) is a large, dual-route, dose-ranging study (N=220) that alone would meet the bar for 'strong'. Because the claim bundles both compounds and the AETT sub-claim rests on one small single-lab study, the combined claim stays at moderate per the grading rule (one small study keeps a claim at moderate; a claim with any weaker bundled part stays below strong). Musk ambrette's photosensitization ground for its skin-product ban is independently documented (Cronin 1984, Giovinazzo 1980) and distinct from the neurotoxicity finding.
Source: Ford 1994 (RIFM) Industry-funded Link to this fact
Health effects / Animal study
AETT, a musk fragrance once common in soaps, deodorants, and cosmetics, caused progressive nerve-fiber demyelination and irreversible pigment build-up in the brains of rats fed the compound for 12-20 weeks; the fragrance industry voluntarily withdrew it from cosmetics in 1978 on the strength of its own data.
Moderate evidence: Small single-lab study (N=16 rats), one route (dietary), one dose pair (25/50 mg/kg/day); AETT was withdrawn from cosmetics in 1978 and is not a current fragrance ingredient.
Source: Spencer 1979, Science Industry-funded Link to this fact
Health effects / Review of other studies
Underarm body odor is mostly made by skin bacteria, not by sweat itself: apocrine-gland secretions are odorless when released, and only turn into the characteristic musk/urine smell after aerobic Corynebacteria metabolize odorless steroid precursors into 16-androstenes, or after bacteria break the goat-like acid 3-methyl-2-hexenoic acid free from its carrier proteins.
Moderate evidence: Review synthesis of older primary biochemistry literature, not this paper's own new data.
Source: Kippenberger 2012, Experimental Dermatology Link to this fact
Health effects / Other evidence
For the synthetic musk fragrance ingredient musk xylol, chemical still sitting in human skin 24 hours after a single application did not stay put: when an FDA lab extended testing to a full week, about three-quarters of the 24-hour skin reservoir had disappeared, while roughly 14-16% of the original applied dose had moved into the fluid representing the bloodstream side of the skin barrier.
Moderate evidence: Single FDA lab, in vitro excised human-skin model with only two human subjects in the extended-study cohort; not a living-human in vivo measurement.
Source: Hood 1996, Food and Chemical Toxicology Link to this fact
Health effects / Other evidence
Hairless guinea pig skin is substantially more permeable than human skin to musk xylol, especially for how much reaches circulation: in vitro, over half of the absorbed dose in guinea pig skin reached the receptor fluid within 24 hours, versus under 5% in human skin, even though both skin types absorbed a similar total amount into the skin itself.
Moderate evidence: Single FDA lab, in vitro excised-skin model; relevant to how much animal skin-absorption data can be extrapolated to humans for fragrance ingredients.
Source: Hood 1996, Food and Chemical Toxicology Link to this fact
Health effects / Other evidence
In 2009 the FEMA authors reported that eight flavor ingredients had lost FEMA GRAS status over the program's life (including calamus, brominated vegetable oil, and musk ambrette) and that a ninth, cinnamyl anthranilate, was abandoned by industry then banned by FDA; FDA also prohibits coumarin and safrole in food, and neither is FEMA GRAS.
Moderate evidence.
Caveats
Industry-reported list; reasons for each revocation are not given in this paper. Written by two FEMA employees and supported by FEMA (the flavor industry trade association); it is the industry's own account of its own program.
Source: Hallagan 2009, Food and Chemical Toxicology Industry-funded Link to this fact
Health effects / Lab study (cells or chemistry)
The same fragrance musks also blocked the androgen receptor at about 3 µM and one subtype of the estrogen receptor (ERβ) at about 2-6 µM, with no sign of acting as a hormone-like agonist in these cells.
Moderate evidence: In vitro only; the authors say effect concentrations are high, have not been found in the environment, and that in-vivo studies are needed before any health conclusion.
Source: Schreurs 2005, Toxicological Sciences Link to this fact
Hidden ingredients / Journalism
Laboratory testing commissioned by US campaigners found 38 chemicals not listed on the label across 17 popular fragrances, 14 per product on average, including hormone-disrupting synthetic musks.
Moderate evidence: NGO report, not peer reviewed; numbers now verified against the primary (Sarantis 2010, in our evidence base); one sample per product, tentative library IDs, no concentrations.
Source: Sealey 2016 (citing Sarantis 2010, Not So Sexy), Environment International Link to this fact
Hidden ingredients / Measured in people or real products
Once in the air, scent chemicals such as linalool, ionones, and the woody musk OTNE ('Iso E Super') reacted with ozone to form dozens of new oxidized chemicals, including a hydroperoxide. None of these was in the product.
Moderate evidence: Compound identities are tentative (formula-level mass spectrometry); products unquantified; no hazard testing.
Source: Wu 2024, Environmental Science & Technology Letters Link to this fact
Hidden ingredients / Review of other studies
Fragrance in deodorants and antiperspirants often functions as a deliberate odor-masking ingredient at percent-level concentrations (e.g., linalool combined with dihydromyrcenol at 0.2-1% w/w, or a multi-fragrance blend of musk, skatole, lemon oil, lavender oil, jasmine, vanillin, benzoin, benzyl acetate, and menthol in one patented licorice-root deodorant), separate from and in addition to any anti-microbial active in the same product.
Moderate evidence.
Caveats
Review compiling cosmetics-industry patents and older formulation studies, not new experimental data; the specific listed formulations are patent examples, not necessarily current marketed products.
Source: Kanlayavattanakul & Lourith 2011, International Journal of Cosmetic Science Link to this fact
Hidden ingredients / Lab study (cells or chemistry)
Testing 62 individually purchased fragrance-related ingredients found in the deodorants, 8 were estrogenic in the same cell assay – including the musk HHCB/galaxolide and benzyl salicylate – at potencies the study describes as comparable to parabens, a preservative class with well-documented weak estrogenic activity.
Moderate evidence.
Caveats
Potencies were 100,000 to 100,000,000 times weaker than estradiol (EC50 3.08×10^-6 to 1.45×10^-4 M; EEF 2.34×10^-8 to 1.15×10^-6); a positive result in this cell assay does not establish that any dose reaches human tissue.
Hidden ingredients / Other evidence
Several flavor chemicals in this review (menthol, carvone, camphor, borneol, terpineol, ionones, damascones and the musks muscone, and civettone) are also fragrance materials, but the FEMA review assesses them only as swallowed food ingredients; it gives non-oral data 'less weight' and has no inhalation or skin-allergy assessment.
Moderate evidence: The paper says some inhalation data may substitute when flavor exposure is far smaller than inhaled exposure; it does not claim any airborne or skin risk from these substances.
Source: Adams 1996, Food and Chemical Toxicology Industry-funded Link to this fact
Hidden ingredients / Other evidence
FEMA has removed at least 14 substances from its GRAS list over the years, including musk ambrette, quinoline, calamus, ethylene oxide, and methyl eugenol; the most common reason was that existing data no longer supported a conclusion of general recognition of safety, not newly shown harm.
Moderate evidence: List and reasons are FEMA's; the paper does not date each removal or give the data behind it. The count of 14 treats calamus and calamus oil as one.
Source: Hallagan 2020, Food and Chemical Toxicology Industry-funded Link to this fact
Hidden ingredients / Measured in people or real products
The lab was Analytical Sciences in Petaluma, California, using modified US EPA methods 8260 and 8270 (GC/MS) plus a separate GC/MS method for six synthetic musks.
Moderate evidence: Method description is brief; no QC data or confirmation status for each compound is given.
Source: Sarantis et al. 2010 (Not So Sexy, Canadian edition) Link to this fact
Hidden ingredients / Measured in people or real products
All 17 tested perfumes, colognes, and body sprays contained at least one synthetic musk; Galaxolide was in 15 and was not on any of those 15 labels.
Moderate evidence: Qualitative detection; musk concentrations are not reported; one sample per product.
Source: Sarantis et al. 2010 (Not So Sexy, Canadian edition) Link to this fact
Hidden ingredients / Lab study (cells or chemistry)
In lab tests on human cells, four fragrance musks (including Galaxolide and Tonalide) blocked the progesterone receptor; Tonalide (AHTN) and Phantolide (AHMI) did so at about 0.02 µM, the strongest effect in the study, and Galaxolide (HHCB) at 0.2 µM.
Moderate evidence.
Caveats
Cell-reporter assay, single compounds, one lab, test-tube concentrations; no animal or human data and no comparison with body levels. Two authors work at the company that sells the assay.
Source: Schreurs 2005, Toxicological Sciences Link to this fact
Hidden ingredients / Other evidence
In a 2005 lab study on mussel gill tissue, six synthetic musks used as fragrance ingredients, including musk xylene, musk ketone, galaxolide and tonalide, blocked the cell's pump that expels foreign chemicals, at micromolar concentrations.
Moderate evidence.
Caveats
Ex-vivo marine mussel gill, one lab, n=3-7 animals per compound, one dye assay; no human cells or exposures; effective concentrations exceed measured water levels and the authors' estimate of human body burdens.
Source: Luckenbach 2005, Environmental Health Perspectives Link to this fact
Hidden ingredients / Other evidence
The 'white musk' scent oil tested in a 2025 Japanese lab study was a blend of synthetic fragrance ingredients: its largest peak was linalool (11.9% of GC peak area), then hedione (8.3%), galaxolide (5.2%), hexyl cinnamal (4.6%), benzyl acetate (3.7%) and tonalide (1.6%), with galaxolide at 34.8 mg/mL and tonalide at 15.0 mg/mL in the neat oil.
Moderate evidence: One product from the study's own co-developer, one analysis; percentages are peak areas, not weight; other peaks were not identified; other 'white musk' products may differ.
Source: Zennifa 2025, Scientific Reports Industry-funded Link to this fact
Indoor air / Other evidence
The white musk pilot used only 10 microliters of undiluted oil on a swab in a 4.2 cubic meter booth, chosen because larger amounts (up to 100 microliters) smelled too strong, and never measured air concentrations of any compound.
Moderate evidence: Describes the design only; if all 10 uL evaporated, galaxolide would reach about 83 ug/m3 (my upper-bound arithmetic from the paper's numbers); actual exposure unknown.
Source: Zennifa 2025, Scientific Reports Industry-funded Link to this fact
The industry / Animal study
Older synthetic musks (musk ambrette, AETT) caused nerve damage in animal studies and were later restricted.
Moderate evidence.
Caveats
Both primaries now read directly (2026-09-26): Spencer 1979 (AETT, N=16, single lab, single route) and Spencer 1984 (musk ambrette, N=220, dual route, dose-ranging). The musk-ambrette evidence alone is large and well-controlled enough to support 'strong', but the claim bundles it with the smaller AETT study, which keeps the combined claim at moderate under the grading rule.
Source: Pinkas 2017, Environmental Research Link to this fact
The industry / Animal study
The study's own authors, including two Research Institute for Fragrance Materials scientists, stated that the doses causing clear nerve damage in rats were 50 to 250 times their own estimate of maximum human fragrance exposure to musk ambrette, and that the lower-dose, longer-term study needed to assess real human risk was never done.
Moderate evidence: This is the study authors' own stated limitation, not an independent follow-up; no lifetime low-dose study has been conducted since (as far as this evidence base has found).
Source: Spencer 1984, Toxicology and Applied Pharmacology Industry-funded Link to this fact
The industry / Animal study
Musk ambrette is no longer used in fragrances; it was withdrawn from all skin-contact products in the 1980s, following both this neurotoxicity finding and separate reports of photoallergic skin reactions in real-world cologne use.
Moderate evidence.
Caveats
The proximate cause of the total skin-contact ban was photoallergy (Cronin 1984), not the neurotoxicity finding directly, which RIFM had already argued had an adequate safety margin via absorption data.
Source: Spencer 1984; Ford 1994, Toxicology and Applied Pharmacology Industry-funded Link to this fact
The industry / Measured in people or real products
A musk fragrance chemical called ATTN (Versalide) disappeared entirely from human tissue in this 1996 study because industry had already stopped making it in 1980, after animal testing showed it damaged nerves – a real-world example of a musk being phased out after a toxicity finding.
Moderate evidence: Absence in 19 samples is consistent with, but does not by itself prove, the discontinued-production explanation the authors give; based on a small single-country sample.
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 / Other evidence
The flavor industry's panel says it relies on exposure, natural occurrence, structural analogy, metabolism, and animal toxicity rather than fixed test batteries, calling this the opposite of 'cookbook toxicology'; it has revoked GRAS for only 10 flavor ingredients since 1959, including musk ambrette in 1985.
Moderate evidence: Authors' own account of their program; no independent audit of the decisions is provided.
Source: Hallagan 1995, Regulatory Toxicology and Pharmacology Industry-funded Link to this fact
The industry / Other evidence
The white musk pilot's fragrance blend was developed by a Tokyo fragrance company (Nextday Co., Ltd) with Kyushu University; the company supported the study and an employee is a co-author, though the paper states no competing interests.
Moderate evidence: Funding amounts and the blend's formula are not disclosed; the authors declare no competing interests.
Source: Zennifa 2025, Scientific Reports Industry-funded Link to this fact
Laws and loopholes / Review of other studies
After German industry stopped using musk xylene in 1993, its level in breast milk fell about 70% in four years, but the related musk ketone, which was not phased out, did not fall.
Moderate evidence: Cites a BgVV 2000 press release; single-country natural experiment.
Source: Schmeiser 2001, International Journal of Hygiene and Environmental Health Link to this fact
What you can do / Review of other studies
Fragrance-free cosmetics and laundry products cut the main routes by which synthetic musks enter the body: skin contact and washed clothing.
Moderate evidence.
Caveats
Route inferred from exposure data; no intervention study of musk body burden. Hutter 2009 (100 Vienna adults) gives cross-sectional human support for the polycyclic musks specifically: monthly-frequency of body lotion and perfume use significantly predicted blood galaxolide/tonalide (beta=0.188-0.192, p<0.05); no cosmetics-use variable predicted nitro-musk (musk ketone/musk xylene) blood levels there. Lignell 2008 (101 Swedish mothers, milk 1996-2003) gives a second, milk-matched confirmation with per-product specificity: perfume use predicted HHCB and perfumed-laundry-detergent use predicted AHTN, but musk xylene showed no association with any product category tested. Still no before/after intervention trial for any musk, and the nitro-musk part of the action's benefit remains unverified in two independent studies now.
Source: Schmeiser 2001, International Journal of Hygiene and Environmental Health 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 / 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 / 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 / Other evidence
EWG Verified bans quaternary ammonium compounds, formaldehyde releasers, isothiazolinones, phthalates, PFAS, boron compounds, and nitro- and polycyclic musks (galaxolide) in licensed cleaners.
Moderate evidence: EWG's own list drawn from other bodies' hazard lists; it shows what the label excludes, not that the remaining ingredients are harmless.
Source: EWG Verified criteria for cleaning products (10.24), Environmental Working Group, 2024 Link to this fact
Fragrance is everywhere / Other evidence
A synthetic musk (ethylene brassylate) was the most persistent fragrance compound tested on cotton, with about 335 µM/g still on the fabric at 14 days versus about 535 µM/g at 1 hour.
Weak evidence: Irregular trend (a spike at 5 d), large standard deviations (±57 to ±109), one spiked mixture, n = 3. Polyester held far less (about 43 µM/g at 14 d).
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 / Lab study (cells or chemistry)
Musk ketone does not damage DNA by itself, but in rat liver enzymes and human liver cells it made known carcinogens like benzo[a]pyrene more mutagenic.
Weak evidence: One laboratory's data (the review's senior author); human-cell LOEL 50 ng/ml is 12-70x above whole-milk levels.
Source: Schmeiser 2001, International Journal of Hygiene and Environmental Health Link to this fact
Health effects / Lab study (cells or chemistry)
A fragrance musk can look estrogen-like in one lab cell system and anti-estrogen-like in another: Galaxolide acted as a full agonist in breast-cancer-cell proliferation but as a blocker of one estrogen receptor subtype, with no agonism, in kidney-derived reporter cells.
Weak evidence: Two different studies and cell types; neither shows an effect in animals or people.
Source: Schreurs 2005, Toxicological Sciences Link to this fact
Health effects / Other evidence
The pump-blocking lasted at least 24 hours after a 2-hour musk exposure in mussel gill tissue, and the authors raise the possibility that low-toxicity chemicals like musks could make other pollutants more harmful.
Weak evidence.
Caveats
Mechanism hypothesis from one ex-vivo mussel study; co-toxicant uptake was not tested in this paper; human relevance is untested and the authors estimate human body burdens are 1-2 orders of magnitude below the effective concentrations.
Source: Luckenbach 2005, Environmental Health Perspectives Link to this fact
Health effects / Other evidence
In a 10-person crossover pilot, volunteers rated a white musk fragrance oil sweeter, more 'gorgeous' and more liked than no scent (like 48.9 to 67.4 of 100; sweet 18.4 to 53.5; gorgeous 14.7 to 49.8), but 'relaxing' and 'calming' ratings did not differ between scent and no scent.
Weak evidence.
Caveats
Single 10-person pilot (physiology n = 9), no sample-size calculation, many uncorrected endpoints; control was no scent only; product co-developed by an author's company (Nextday), no conflict declared. 21 VAS items uncorrected for multiple comparisons; the 'unscented' session had no odor, so participants could tell the sessions apart.
Source: Zennifa 2025, Scientific Reports Industry-funded Link to this fact
Health effects / Other evidence
In the same pilot, mood scores for tension, fatigue and total mood disturbance fell during the white musk session, but fatigue and confusion fell in the no-scent session too and no mood scale differed between the two sessions.
Weak evidence.
Caveats
Single 10-person pilot (physiology n = 9), no sample-size calculation, many uncorrected endpoints; control was no scent only; product co-developed by an author's company (Nextday), no conflict declared. Within-condition significance versus non-significance is not a between-condition difference (between-condition p 0.435 to 0.959).
Source: Zennifa 2025, Scientific Reports Industry-funded Link to this fact
Information, not medical advice. See also: myths we won’t tell you.