Propylparaben on your skin: a safety profile
Moderate riskPropylparaben is absorbed through intact skin, and the intact form (active estrogen and androgen antagonist) reaches systemic circulation without the same hydrolytic deactivation that limits oral bioavailability. The most relevant dermal exposures are from leave-on products: moisturizers, sunscreens, body lotions, and facial creams. Unlike methylparaben, EU regulations now restrict propylparaben specifically in leave-on products for the diaper area in young children, reflecting concern about high-absorption-area application. Occupational dermal exposure is significant for cosmetics formulators and workers in personal care product manufacturing. Nail salon workers may have occupational exposure to propylparaben in nail treatments. The safety margin between typical consumer dermal exposure and doses producing endocrine effects in animal studies is considered adequate by SCCS but is narrowed when propylparaben is co-applied with other parabens and endocrine-disrupting cosmetic ingredients.
What is propylparaben?
The IUPAC name is propyl 4-hydroxybenzoate.
Also known as: propyl 4-hydroxybenzoate, Propyl paraben, Nipasol, Propyl p-hydroxybenzoate.
- IUPAC name
- propyl 4-hydroxybenzoate
- CAS number
- 94-13-3
- Molecular formula
- C10H12O3
- Molecular weight
- 180.2 g/mol
- SMILES
- CCCOC(=O)C1=CC=C(C=C1)O
- PubChem CID
- 7175
Risk for people
Moderate riskPropylparaben is absorbed through intact skin, and the intact form (active estrogen and androgen antagonist) reaches systemic circulation without the same hydrolytic deactivation that limits oral bioavailability. The most relevant dermal exposures are from leave-on products: moisturizers, sunscreens, body lotions, and facial creams. Unlike methylparaben, EU regulations now restrict propylparaben specifically in leave-on products for the diaper area in young children, reflecting concern about high-absorption-area application. Occupational dermal exposure is significant for cosmetics formulators and workers in personal care product manufacturing. Nail salon workers may have occupational exposure to propylparaben in nail treatments. The safety margin between typical consumer dermal exposure and doses producing endocrine effects in animal studies is considered adequate by SCCS but is narrowed when propylparaben is co-applied with other parabens and endocrine-disrupting cosmetic ingredients.
Regulatory consensus
8 regulatory and scientific bodies have classified Propylparaben. The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 9 positive / 8 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 9 positive / 8 negative reports) | |
| EPA CTX / Skin-Eye | — | Eye Irritation: Category 6.4A (Category 2A) (score: high) | |
| EPA CTX / Skin-Eye | — | Skin Irritation: Category 6.3B (Category 3) (score: moderate) | |
| EPA CTX / Skin-Eye | — | Skin Sensitization: Category 6.5B (Category 1) (score: moderate) | |
| EPA CTX / Skin-Eye | — | skin sensitisation: in vivo (LLNA): Not likely to be sensitizing (score: low) | |
| EPA CTX / Skin-Eye | — | skin sensitisation: in vivo (non-LLNA): Not likely to be sensitizing (score: low) | |
| EPA CTX / Skin-Eye | — | eye irritation: in vivo: Studies Indicate No Significant Irritation (score: low) |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where you encounter propylparaben
- Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
- Occupational Environments — Factories, Warehouses, Transportation vehicles
- Personal Care — shampoo, conditioner, lotion, cosmetics, sunscreen
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Propylparaben:
-
Physical/mechanical pest control (IPM)
Trade-offs: More labor-intensive. May not be sufficient for severe infestations.Relative cost: 1.2-2×
Frequently asked questions
Is propylparaben safe for you?
Propylparaben is absorbed through intact skin, and the intact form (active estrogen and androgen antagonist) reaches systemic circulation without the same hydrolytic deactivation that limits oral bioavailability. The most relevant dermal exposures are from leave-on products: moisturizers, sunscreens, body lotions, and facial creams. Unlike methylparaben, EU regulations now restrict propylparaben specifically in leave-on products for the diaper area in young children, reflecting concern about high-absorption-area application. Occupational dermal exposure is significant for cosmetics formulators and workers in personal care product manufacturing. Nail salon workers may have occupational exposure to propylparaben in nail treatments. The safety margin between typical consumer dermal exposure and doses producing endocrine effects in animal studies is considered adequate by SCCS but is narrowed when propylparaben is co-applied with other parabens and endocrine-disrupting cosmetic ingredients.
What products contain propylparaben?
Propylparaben appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments); shampoo (Personal care).
Why do regulators disagree about propylparaben?
Propylparaben has been classified by 8 agencies including EPA CTX / Genetox, EPA CTX / Genetox, EPA CTX / Skin-Eye, EPA CTX / Skin-Eye, EPA CTX / Skin-Eye, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.
See Propylparaben in the body app
Look up products containing propylparaben, compare to alternatives, and explore the full data record.
Open in body View raw API dataSources (2)
- EU Scientific Committee on Consumer Safety (SCCS): Opinion on Parabens (Methylparaben, Ethylparaben, Propylparaben, Butylparaben) in Cosmetics (2021) — regulatory
- US FDA: Parabens in Cosmetics — Safety Assessment and Consumer Information Update (2023) — regulatory
Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →