What is the difference between TPO and TPO-L?

As the cosmetics industry moves toward safer and cleaner formulations, ingredient regulations continue to evolve. A recent update that created confusion is the ban on TPO in cosmetics starting September 1, 2025. Many worry that TPO L is also banned, but this is not the case.

In this article, Elegelli explains the difference between TPO (Trimethylbenzoyl Diphenylphosphine Oxide) and TPO L (Ethyl Trimethylbenzoyl Phenylphosphinate). You will see why TPO is banned, why TPO L remains allowed, and how to make informed decisions for your products or your salon.

Comparison Table, TPO versus TPO L

Characteristic	TPO	TPO L
Image
Chemical name	Trimethylbenzoyl Diphenylphosphine Oxide	Ethyl Trimethylbenzoyl Phenylphosphinate
CAS number	4559 70 0	84434 11 7
Molecular formula	C12 H11 O P	C18 H21 O3 P
Appearance	Yellow orange, odorless	Clear liquid
Common use	Photoinitiator in UV cured cosmetics	Photoinitiator in UV and LED cured cosmetics
Regulatory status in the EU	Banned in cosmetics after September 1, 2025	Not banned, considered safe
Health risks	Potential reproductive toxicity, skin and eye irritation	No health risk identified
Recommended use	Avoid in future formulations	Preferred replacement for TPO in compliant products

What is TPO

TPO is a photoinitiator used in gel polish and other UV cured cosmetics to trigger polymerization under UV or LED light. It helps transform liquid gel polish into a hard and durable coating.

TPO was widely used because it cures quickly and delivers a strong glossy finish. Concerns have emerged about its toxicity and potential health risks, especially reproductive toxicity and environmental impact.

What is TPO L

TPO L is a new generation photoinitiator. It serves the same role as TPO, yet it is considered safer and more stable.

• Fast curing under LED or UV lamps
• Strong color stability with no yellowing
• Excellent depth of cure
• Long lasting results

The key difference is that TPO L shows a better safety profile and is currently not classified as toxic under the latest regulations.

TPO L is not just a substitute, it outperforms TPO and lets us create high performance gel polish.

Why is TPO banned

The European Commission has banned the use of TPO in cosmetics under Regulation EC number 1223 slash 2009, effective from September 1, 2025, following evaluations by the Scientific Committee on Consumer Safety.

Main reasons for the ban

• Reproductive toxicity
• Possible endocrine disruption
• Environmental concerns

The precautionary principle applies, the EU prefers to act with caution and remove ingredients that may cause harm.

Industry confusion

In salons and online communities confusion is growing. Some brands and professionals remove every product that mentions TPO, including those that contain only TPO L, out of fear of breaking the rules. This can create unneeded panic, lost sales, and even misleading marketing.

What everyone should know

• TPO is banned
• TPO L is not banned
• They are not the same ingredient

Smart brands reformulate early, TPO L gives you safety without any compromise on quality.

How to check if a product contains TPO or TPO L

Read the INCI name on labels or safety data sheets. Here is how to tell the difference.

Why many brands move to TPO L

Many leading brands reformulate gel polish, BIAB, and other UV and LED cured products to replace TPO with TPO L or other safe photoinitiators.

Benefits of switching to TPO L

• Compliant with the new rules
• Safer for clients and professionals
• Maintains optimal curing performance
• No yellowing and no discoloration

What to do as a consumer or a professional

1. Check your products now, review current stock and remove items that contain TPO before September 1. Products with TPO L are safe.
2. Ask your supplier, request clarity on TPO versus TPO L in their products.
3. Choose TPO L based formulas, select brands that use TPO L for better safety and compliance.
4. Inform clients and team, share the difference so everyone can make informed choices.

Conclusion

The TPO ban fits a larger move toward safer and more transparent cosmetics. Although the names look similar, TPO L is a different and safer photoinitiator that remains allowed.

By understanding the difference and choosing wisely, you stay compliant, protect client health, and keep delivering quality services with total peace of mind.

At Elegelli we commit to transparency, safety, and constant innovation. Our products are free of TPO and use TPO L where needed, so you get high performance with complete confidence.

TPO is obsolete, TPO L is the future.

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