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 / 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
Information, not medical advice. See also: myths we won’t tell you.