Do Gel Nails Cause Infertility? Understanding the TPO Fertility Headlines
Quick Summary
There is no basis for turning the TPO regulatory change into the simple statement "gel nails cause infertility." TPO, an ingredient used in some gel nail products, was given a Category 1B reproductive-toxicant hazard classification, and that classification is what triggered the regulatory restriction covered in our Great Britain TPO guide.
A hazard classification is not the same statement as proof that an ordinary gel manicure causes infertility in the people who receive it. This article explains that distinction calmly and in plain language.
Why Is Fertility Being Mentioned at All?
TPO (Trimethylbenzoyl Diphenylphosphine Oxide) was classified as a Category 1B substance toxic for reproduction, under Commission Delegated Regulation (EU) 2024/197. That classification is a formal, evidence-based hazard classification, and it is what triggered the regulatory restrictions on TPO in cosmetic products described in our companion guide on the Great Britain TPO transition.
That is the honest, full explanation for why fertility appears in headlines about this subject at all. What follows is where the headlines and the underlying science tend to part ways.
Hazard and Actual Exposure Are Not the Same Question
A hazard classification describes a harmful property that a substance can possess under relevant conditions. It is an important and legitimate scientific finding, and it is entirely reasonable that it triggered regulatory action — this article is not suggesting that classification was wrong, or that regulators overreacted.
But the actual level of risk to any individual also depends on the level of exposure, which is a separate question shaped by matters such as:
- the amount of the substance involved;
- its concentration in the finished product;
- the route by which a person is exposed to it;
- how frequently exposure happens; and
- for how long.
The distinction, stated plainly
"This ingredient has received a reproductive-toxicity classification" is not the same scientific statement as "a gel manicure has been shown to cause infertility." Trade press coverage of the CTPA's own position on this point has quoted Caroline Rainsford, the CTPA's director of science, describing the classification as based on a "worst-case" toxicological assessment rather than on how TPO is typically used in a finished nail product, and stating that the amount used in nail products is reported to be far lower — by some reporting, more than a thousand times lower — than the exposure levels associated with adverse fertility effects in the underlying evidence.
None of this means exposure is irrelevant or that the classification should be dismissed. It means the correct comparison is not "TPO was found capable of causing harm under laboratory test conditions" versus "gel manicures are safe" — it is a more careful comparison between the exposure levels involved in ordinary cosmetic use and the exposure levels associated with the effects observed in the underlying evidence.
The Previous Safety Assessment, in Context
TPO had previously been assessed by the EU's Scientific Committee on Consumer Safety (SCCS), which found it acceptable under specified professional-use conditions for artificial nail applications. That earlier assessment predates the later Category 1B classification, which operates under a different regulatory mechanism: once a substance receives a harmonised CMR 1A or 1B classification, earlier safety opinions no longer automatically apply unless they are formally updated.
This is not a contradiction or a sign that earlier regulators were careless, and it is not evidence of a hidden problem being uncovered. It reflects how cosmetics regulation is structured: a hazard classification changes the applicable rules automatically, independently of any specific prior product assessment.
Should I Stop Having Gel Manicures?
Gel manicures themselves have not been banned in Great Britain, as explained in our article Are Gel Nails Banned in the UK? Salons can continue working with compliant, TPO-free or never-affected formulations.
If you have an individual medical concern — including concerns related to pregnancy or fertility — the appropriate source of guidance is a healthcare professional who can consider your specific circumstances, rather than a newspaper headline, a social-media post, or this article. This article is written to explain the regulatory picture, not to provide personalised medical advice.
Does TPO-Free Mean No Allergy or Safety Risk at All?
No. Removing TPO addresses one specific ingredient. Other ingredients and application factors still matter, in the same way they always have. Good professional practice includes avoiding uncured gel product on the skin, using products according to the manufacturer's instructions, and curing them fully and correctly under an appropriate nail lamp. If you are prone to skin sensitivity, patch testing remains a reasonable precaution regardless of a product's TPO status.
Key Takeaways
- Before: "Scientists discovered gel nails cause infertility."
- After: A particular ingredient received a reproductive-toxicity hazard classification that changed cosmetic regulation. That is not the same as evidence that ordinary gel manicures cause infertility.
Related Articles
- → Are Gel Nails Banned in the UK? No — Here Is What Has Actually Changed
- → For nail professionals, see our detailed Great Britain TPO regulatory guide
Frequently Asked Questions
Has gel polish been proven to cause infertility?
No. TPO, an ingredient used in some gel polish formulations, was given a reproductive-toxicity hazard classification based on the underlying toxicology evidence. That classification is not the same as evidence that an ordinary gel manicure causes infertility in the people who receive it.
Why was TPO classified as toxic for reproduction?
TPO received a Category 1B classification under Commission Delegated Regulation (EU) 2024/197 following an assessment of the underlying toxicology evidence. That classification is what triggered the cosmetic-product restrictions described in our Great Britain TPO guide.
Does the classification apply to the finished cured manicure?
The classification is a hazard finding about the substance TPO. Whether it translates into meaningful risk in a specific finished, cured manicure depends on exposure factors such as amount, concentration, route and duration — which is why hazard and risk are treated as separate questions in toxicology.
Are TPO-free gels different?
TPO-free products use a different, permitted photoinitiator instead of TPO. They remain UV/LED-curable gel systems, formulated to avoid the specific ingredient subject to the current restriction.
Can pregnant clients have gel nails?
This is an individual medical question that this article cannot answer for you. If you are pregnant and have concerns about any nail product or service, discuss them with your midwife, GP or another appropriate healthcare professional.
Should I ask my technician about their products?
You are welcome to. A professional technician will be able to tell you, or check, whether the products they use are TPO-free, and can talk you through their approach to safe application and curing.
Professional Note
This article explains regulatory and toxicological terminology in general terms for public understanding. It does not provide medical advice and does not assess individual risk. For personal medical guidance, including questions about pregnancy or fertility, consult an appropriate healthcare professional.
Sources: European Commission, TPO in Nail Products — Questions & Answers; CTPA, Ban of TPO (Gel Nail Ingredient) in the EU and GB. This article reflects publicly available regulatory information and trade-press reporting of CTPA's published position, current at the time of writing, and is not medical advice. TheNailWiki is an independent educational resource and maintains editorial independence from all commercial interests.