quinestrol
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A synthetic estrogen with prolonged action used in hormone therapy, subject to pharmaceutical regulation and not permitted as a cosmetic ingredient.
Quinestrol (17-alpha-ethynylestradiol 3-cyclopentyl ether) is a synthetic estrogen related to ethinyl estradiol with enhanced lipid solubility and prolonged duration of action. It is used in hormone replacement therapy and is not authorized for cosmetic use. EU cosmetics law would restrict or prohibit its use due to potent estrogenic effects and systemic health risks. It falls outside the scope of cosmetic ingredient safety assessments due to its drug classification.
Known concerns
- Potent estrogenic activity — systemic health risks
- Not authorized for cosmetic use in EU
- Drug substance classification — pharmaceutical use only
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.