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.
Hidden ingredients / Review of other studies
None of the products used by the four affected children was ever chemically analyzed; the researchers could only assume that a product labeled as containing lavender oil actually met the international composition standard.
Strong evidence.
Caveats
Stated by the authors as a limitation; an industry letter later claimed one named cologne contained diethyl phthalate and no lavender oil, which has also never been independently verified.
Source: Ramsey 2019, The Journal of Clinical Endocrinology & Metabolism Link to this fact
Hidden ingredients / Measured in people or real products
Counting the word "parfum" undercounts scented children's products, because essential oils and individual fragrance chemicals are listed under other names.
Moderate evidence: Undercount size not measured for these products.
Source: Uber 2024, Jornal de Pediatria (Rio de Janeiro) Link to this fact
Hidden ingredients / Review of other studies
Nobody independently analyzed the products used by the children in the 2019 lavender breast-growth case reports: the only published analysis was by an essential-oil trade consortium, which covered two of the three products and reported no numbers; the researchers concede the products contain other, partly synthetic, substances whose composition may vary by where they were bought.
Moderate evidence.
Caveats
One earlier product was analyzed independently of industry: Diaz 2016 (now read as a primary), from the same clinic, used academic HPLC-UV/MS (McMaster University) to confirm linalool and linalyl acetate in an agua de violetas cologne. That analysis concerns Diaz's own Case 2 patient, not any of the three products used by Ramsey 2019's four patients (Mi Tesoro, Crusellas Violet Water, Baby Magic baby bath), so the claim as it applies to Ramsey 2019's own case-report products stands: none of those three was ever independently analyzed. The NIEHS reply to the consortium letter on the third product (dgaa227) has still not been read.
Source: Ramsey et al. 2020 (JCEM reply), The Journal of Clinical Endocrinology & Metabolism Link to this fact
Hidden ingredients / Measured in people or real products
In one of the best-known reports linking 'lavender' products to breast growth in children, the boy's violet-water cologne declared no essential oil on its ingredient list; the essential-oil industry's own analysis found none, but reported a synthetic fragrance allergen (alpha-isomethyl ionone), azo dyes, and diethyl phthalate, a fragrance solvent suspected of hormone disruption.
Moderate evidence: Industry-funded letter; GC-MS/LC-MS/MS results given as prose with no concentrations, detection limits, lab or sample provenance; not independently confirmed.
Source: Giroux & Orjubin 2020 (JCEM letter; Consortium Huiles Essentielles), The Journal of Clinical Endocrinology & Metabolism Industry-funded Link to this fact
Hidden ingredients / Measured in people or real products
Benzyl alcohol, a fragrance allergen dubbed the "covert fragrance," was found in 32 of 533 US baby and children's personal care products (6%) with no "fragrance," "perfume," or "parfum" wording anywhere on the label.
Moderate evidence: Doesn't establish whether these products are marketed "fragrance-free"; measures label wording, not chemical content verification.
Hidden ingredients / Government agency
In a screening-level EPA estimate for commercial food-contact hard surfaces, chronic dietary exposure from ADBAC at the maximum label rates exceeded the chronic reference dose for infants (about 400% at 16,000 ppm with a water rinse; about 260% at 4,900 ppm without one) and young children, but not at the 400 ppm tolerance exemption (infants 21%).
Moderate evidence.
Caveats
Screening assumptions: maximum label concentration, 44.3% transfer from surface to food, no measured food residues; EPA calls the label rates well above the tolerance exemption and does not state that real exposure exceeds the dose.
Source: US EPA 2017 Link to this fact
Hidden ingredients / Self-reported survey
In this Swedish sample the diethyl phthalate metabolite MEP was not higher with fragrance use in mothers or children; it was higher with sunscreen (mothers) and eye make-up (children, only 6 users), in contrast to US studies where perfume use was the strongest MEP predictor.
Weak evidence.
Caveats
Frequency-of-use question rather than 24-hour recall, very few weekly fragrance users (5 children), borderline CIs, Swedish MEP far below US levels; a null in a small sample, not evidence that perfume is free of DEP.
Source: Larsson 2014, Environment International Link to this fact
Hidden ingredients / Measured in people or real products
In the same study, scented household cleaning products were not linked to higher levels of any measured chemical, and urine BPA was lower in children from homes that used them (ratio 0.69, 95% CI 0.49-0.98), so 'scented products' did not behave as one exposure.
Weak evidence: Likely chance or residual confounding on a wide multi-model estimate; shows heterogeneity of product categories rather than a protective effect.
Source: Fandiño-Del-Rio 2024, Journal of Exposure Science & Environmental Epidemiology Link to this fact
Information, not medical advice. See also: myths we won’t tell you.