TPO free gel polish is any gel formula without trimethylbenzoyl diphenylphosphine oxide, the photoinitiator the EU banned in cosmetics on September 1, 2025 under EU Cosmetics Regulation 1223/2009. For US salon owners, the ban is not law here, but global brands are reformulating anyway, so TPO free gel polish is now easier to stock and clients are starting to ask by name.
1. What Is TPO in Gel Polish, and Why Was It Used?
TPO (trimethylbenzoyl diphenylphosphine oxide) is a photoinitiator — the molecule inside your gel bottle that reacts under UV or LED light and starts the polymerization that cures the coat solid. Without a photoinitiator, gel stays liquid under the lamp and never sets.
Brands built around TPO for four reasons: it absorbs light across a broad UV range (both 365 nm UV and 405 nm LED), it cures fast (30 to 60 seconds per coat under most 48W lamps), the cured film stays bright white and doesn't yellow the way older TPO alternatives did, and it holds well in high-pigment shades. That combination made it the default photoinitiator in most gel polish lines from around 2010 onward.
TPO is not unique to nails. It is also used in printing inks, dental composites, and industrial coatings, where the EU reclassification does not apply. The 2025 decision covers cosmetic uses only.
2. What Did the EU Actually Ban, and When?
Effective September 1, 2025, the European Union prohibited TPO in cosmetics under the EU Cosmetics Regulation (EC) No. 1223/2009. The trigger was TPO's reclassification as a CMR Category 1B substance under the EU's CLP Regulation — meaning it is presumed toxic to reproduction based largely on animal studies. Once a substance is CMR 1B, EU cosmetics law automatically prohibits it unless a specific derogation is granted, and none was.
Four details US salon owners should know:
- Precautionary basis. The European Commission itself describes the human evidence as limited; the classification rests mainly on animal studies. This is a precautionary standard, not proof of harm in salon use.
- No professional carve-out. TPO had been allowed for professional use only under prior rules. The new prohibition covers professional and consumer use alike.
- No sell-through period. Existing and even opened stock cannot legally be used after September 1, 2025 — remaining product must be removed and disposed of.
- Geographic scope. The ban applies across all 27 EU member states plus Norway and Switzerland (EEA countries).
Important: this is not a ban on gel polish. Gels reformulated with alternative photoinitiators — TPO-L, BAPO, Ivocerin — remain legal in the EU.
3. How Is TPO Different from HEMA?
This is the most common mix-up we hear at ND. TPO and HEMA are two different ingredients doing two different jobs, and they have two different regulatory histories — HEMA is a documented skin sensitizer flagged by the American Contact Dermatitis Society as Allergen of the Year 2018.
|
|
TPO
|
HEMA
|
|---|---|---|
| What it is | Photoinitiator (triggers curing under the lamp) | Monomer (helps gel adhere and flex) |
| Main concern | Reproductive-toxicity reclassification (CMR 1B) | Skin sensitization / allergic contact dermatitis |
| EU status | Banned in cosmetics from Sept 1, 2025 | Restricted to professional use only since 2021 (not banned) |
| US status | Still legal | Still legal |
So a polish can be HEMA-free but still contain TPO, or the reverse. "TPO-free" and "HEMA-free" are two separate claims, and if you want both, the label has to state both.
4. Does the EU TPO Ban Affect US Salons?
Legally, no. Neither the FDA nor the UK's Office for Product Safety and Standards has banned TPO, so gels containing it remain legal to sell and use in US salons. The US regulates cosmetics under a different framework and has not adopted the EU's CMR-driven prohibition — safety review at the ingredient level is handled by the industry-funded Cosmetic Ingredient Review (CIR) and the FDA.
That said, the ban still reaches the US market in three practical ways:
- 1. Global reformulation. Rather than run two SKUs (one EU-compliant, one US-legal), most global brands reformulated their whole line TPO-free. Even without a US mandate, TPO-free gels are increasingly the default on the shelf.
- 2. Client questions. Clients who follow beauty news, or who split time in Europe, are asking whether the gels at your station contain TPO. Having an answer ready — and TPO-free options in the tray — is now a client-communication skill.
- 3. Regulatory direction of travel. California's Proposition 65 and periodic FDA review mean US rules can shift. Moving to TPO-free now is a low-cost way to future-proof stock and marketing claims.
"In the two months after the EU headline hit in September 2025, our salon had at least one 'does this have TPO?' question every day. Half of those clients switched to our HEMA and TPO free tray after the first patch test. We didn't lose anyone to it — but we would have lost the sensitive-skin bookings if we hadn't been ready to say yes."
— Anna Nguyen, Licensed Nail Tech (5+ yrs, San Jose CA), contributor at ND Nail Supply5. How Do You Spot TPO on a Gel Polish Label?
For US salons, moving to TPO-free is a positioning and risk decision, not a legal one. Reading the INCI ingredient list is the only reliable way to confirm — "free-from" front-label claims vary in accuracy.
- Look for the INCI name. On the ingredient panel, TPO appears as "Trimethylbenzoyl Diphenylphosphine Oxide" or sometimes "Diphenyl(2,4,6-Trimethylbenzoyl) Phosphine Oxide." If either appears, the product contains TPO.
- Trust explicit claims with the INCI backup. Prefer formulas labeled "TPO-free" and — if allergy risk matters — "HEMA-free" as well. Confirm against the ingredient list, not just the front label.
- Ask your supplier for confirmation in writing. Any reputable wholesale account manager can confirm current and next-batch formulation status. At ND Nail Supply, this is part of the pro-account onboarding sheet.
6. TPO Free Gel Polish Options at ND Nail Supply
If you want gel polish that removes both HEMA and TPO, five lines carried at ND currently meet both criteria:
- A'DOR Gel-Ons — HEMA-free + TPO-free (note: A'DOR's separate "Gel-ous" line is HEMA-free only; for both, choose Gel-Ons)
- OPI Intelli-Gel — reformulated line, HEMA-free + TPO-free
- Kiara Sky Gel Pro — HEMA-free + TPO-free with strong pigment coverage
- Aprés Gel Couleur — HEMA-free + TPO-free, popular for extension work
- DND HEMA & TPO Free Collection — dedicated sensitive-skin range from a mainstream brand
7. Nail Tech FAQ: TPO Free Gel Polish
Is gel polish banned in Europe?
No — the EU banned the ingredient TPO in cosmetics as of September 1, 2025 under the EU Cosmetics Regulation. Gels reformulated without TPO are still legal and sold across the EU.
Why did the EU ban TPO in gel polish?
TPO was reclassified as a CMR Category 1B substance under the EU's CLP Regulation — presumed toxic to reproduction based largely on animal studies. EU cosmetics law automatically prohibits CMR substances, so the classification triggered the ban.
Is TPO banned in the US?
No. Neither the FDA nor the UK has banned TPO as of 2026, so gel polish containing it is still legal to sell and use in US salons. Many global brands have gone TPO-free voluntarily to keep one formula for both markets.
What's the difference between TPO-free and HEMA-free gel polish?
They're two separate claims. TPO is a photoinitiator linked to a reproductive-toxicity reclassification; HEMA is a monomer linked to skin allergies. A polish can be HEMA-free but still contain TPO — for both benefits, look for a label that states both.
How do I know if my gel polish contains TPO?
Check the INCI ingredient list for "Trimethylbenzoyl Diphenylphosphine Oxide." If it appears, the product contains TPO. For confirmation on current and future batches, ask your wholesale supplier.
Regulatory & safety note: This article is general information based on current EU and US regulation as of August 2026, not legal or medical advice. Regulations change and vary by country — confirm current requirements for your region with your supplier or a qualified professional. "TPO-free" and "HEMA-free" reduce specific ingredients of concern but do not eliminate all allergy risk. For clients with a known reaction, patch-test first.