Do Gel Nails Cause Infertility? What the TPO Headlines Are Not Explaining

If you have read that the new “gel nail ban” happened because gel manicures cause fertility problems, there is an important distinction missing from that statement.

TPO has received a reproductive toxicity hazard classification, and this classification has consequently triggered its prohibition in cosmetic products. That is not the same statement as evidence that having gel manicures causes infertility in humans.

Where the Fertility Story Comes From

TPO was given a Category 1B reproductive toxicant classification. This comes from UK and EU chemicals law, based on animal studies. A hazard classification like this describes something a substance can do under tested laboratory conditions. It is not the same as a documented case of harm in an actual human nail client.

Here is the legal chain of events: under cosmetics law, once a substance gets a CMR Category 1A or 1B classification, it is automatically banned from cosmetics. There is only one way around this, applying for a specific exemption and having it granted. No exemption was applied for with TPO, so the ban followed automatically. This is the direct cause of the ban. It did not come from a new case, incident, or clinical finding involving nail salons.

Hazard Is Not the Same Thing as Exposure

A substance can have a hazardous property under lab conditions. Whether that translates into real risk for you depends on several things: how much of the substance you are exposed to, how strong the concentration is, how it gets into your body, how often and for how long, and how the finished product is actually used.

Chemicals classification law is deliberately cautious. Its whole job is to flag possible hazards early, before any harm can happen, using a worst-case reading of the evidence. Cosmetics law then adds a separate layer, looking at how a product is genuinely used. This is why a hazard classification and a specific, real judgement about salon-level exposure are two different things, even though the classification is what legally triggers the ban.

What the Earlier Safety Opinion Said

Before this reclassification, TPO had already been checked by the Scientific Committee on Consumer Safety (SCCS). This is the EU’s independent scientific body for cosmetic ingredient safety. In 2015, in an opinion numbered SCCS/1558/15, it looked specifically at TPO in professional artificial nail systems. It found TPO safe at a maximum strength of 5%, under the conditions it tested. It also flagged TPO as a moderate skin sensitiser.

This is not the EU “admitting” TPO was safe in some way that contradicts the later ban. There is no conspiracy or contradiction here. The two conclusions simply belong to two different regulatory processes. The 2015 opinion looked at safety by concentration, under TPO’s classification at that time. The later CMR 1B reclassification comes from separate chemicals law, and it triggers a ban automatically through its own legal route, regardless of the earlier opinion. Once a CMR 1A or 1B classification applies, older SCCS opinions stop applying too, unless someone formally asks for a fresh safety review.

The Exposure Comparison From the Industry’s Scientific Body

The Cosmetic, Toiletry and Perfumery Association (CTPA), the UK trade body for the cosmetics industry, has explained that the classification reflects a worst-case scenario, not how TPO is actually used in nail products. Its Director of Science, Caroline Rainsford, has said the amount of TPO used in nail products is “over a thousand times less than the amount which could have any negative effect” found in the underlying studies. She also notes the product is applied to the nail, not the skin.

This context helps explain why trade and professional bodies describe the change as cautious and classification-driven, rather than as proof of harm at typical salon-level exposure.

Why the Classification Still Triggered a Ban Despite This Context

Cosmetics law does not weigh a substance’s classification against a custom, product-specific risk assessment before deciding whether to ban it. Once a formal CMR 1A or 1B classification applies, the ban in cosmetic products follows automatically, unless someone requests a specific exemption and it survives its own safety review. This is a deliberate, cautious legal design. It is not a judgement that has already considered the CTPA’s exposure comparison and rejected it.

What Clients Are Likely to Ask

Have gel manicures been proven to cause infertility? No. The classification is based on animal study evidence at hazard-assessment exposure levels, not on clinical findings in salon clients.

Why prohibit TPO if normal cosmetic exposure is much lower? Because cosmetics law prohibits CMR 1A/1B substances automatically upon classification, as a precautionary measure, independent of a bespoke exposure assessment for each specific product category.

Is TPO dangerous? It carries a hazard classification under chemicals law. Whether a specific level of exposure translates into meaningful risk is a separate question this article cannot answer for any individual, and no claim of individual risk is made here.

Should clients stop having gel manicures? This article does not offer medical advice. Compliant, TPO-free gel systems continue to exist and continue to be regulated cosmetic products.

Are TPO-free products automatically safe? TPO-free status addresses this one specific restriction. It does not remove the need for correct curing, proper technique, and attention to any other sensitising ingredients a formulation may contain.

Does the TPO classification mean every photoinitiator is dangerous? No. TPO’s classification is specific to TPO. Other photoinitiators are subject to their own separate safety assessments and regulatory status.

About Radina Ignatova and Her Teaching Philosophy

About the Author

Radina Ignatova

Professional Nail Expert | International Nail Educator

I am Radina Ignatova, a Professional Nail Expert since 2014 and International Nail Educator, based in Scotland, UK. I am the Founder of Artistic Touch Nail Training Academy and TheNailWiki.

At Artistic Touch Nail Training Academy, I provide professional online nail courses specialising in dual forms, gel systems, polygel application, advanced nail structure, E-File work and Russian Manicure, with a strong focus on professional salon safety. I continue to work actively in salon practice, ensuring that all education reflects real client scenarios and current industry standards.

My teaching philosophy is simple: I show real salon challenges, real mistakes and real performance testing, not just perfect demonstrations. This is how you develop genuine technical competence and become a confident, capable nail professional.

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