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Ingredient dossier · No. 008

Diethyl Phthalate (DEP)

Also: DEP · phthalic acid diethyl ester · diethyl benzene-1,2-dicarboxylate


Avoidthe most common fragrance phthalate and a near-universal exposure for women through scented personal-care products.


01 · Hormonal impact

Fertility & hormonal impact

Evidence
ModerateAnimal studies with mechanistic evidence

DEP is the phthalate most commonly used in fragranced personal-care products, and its metabolite (MEP) is detected in the urine of nearly all women — making it one of the most widespread everyday phthalate exposures. As a phthalate it shares the family's endocrine-disrupting profile and contributes to total phthalate body burden, which in women's fertility cohorts has been associated with diminished ovarian reserve and poorer assisted-reproduction outcomes. DEP's own human reproductive evidence is weaker than that for DEHP or DBP, but because it is applied daily through perfume, lotion, and other scented products, cumulative exposure during the preconception window is a realistic concern.


02 · Where it appears

Found in.

01Perfume and fragranced body mist
02Scented body lotion
03Shampoo and conditioner
04Hair styling products
05Scented deodorant
06Nail care products

03 · The regulators

Two jurisdictions, two different verdicts.

European Union

Not currently restricted in cosmetics but flagged as an endocrine disruptor of concern under the EU ED strategy and under SVHC assessment.

United States · FDA

No restriction in cosmetics. CDC NHANES biomonitoring data show widespread population exposure.


04 · Sources

The receipts.

  1. [01]
  2. [02]
    ATSDR — Diethyl phthalate toxic substance portal
    wwwn.cdc.gov/TSP/substances/ToxSubstance.aspx?toxid=112
  3. [03]
    CDC — National Exposure Report biomonitoring data
    www.cdc.gov/biomonitoring/resources/national-exposure-report.html

05 · Related dossiers
01PhthalatesD · 1202BPA (Bisphenol A)D · 1203TolueneD · 15
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