What exactly is TPO?
TPO is an ingredient found in some nail polishes and gels. Its role is to initiate the curing process in a UV or LED lamp. It is worth noting that according to Regulation (EC) No. 1223/2009 on cosmetics, as of September 1, 2025, TPO has been removed from the list of permitted substances in cosmetic products.
In the chemical and cosmetic industry, TPO is known by various names, but it always refers to the same compound — Trimethylbenzoyl Diphenylphosphine Oxide. It can also be found under names such as Diphenyl (2,4,6-trimethylbenzoyl)phosphine oxide or 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide.
What about the substitutes?
When TPO was withdrawn from cosmetics due to the European Commission's decision regarding restrictions on CMR substances, other safe substances that fully meet their function began to be used. They guarantee the durability of styling without concerns for the user's health.
Still allowed and legal in cosmetics after September 1, 2025:
- TPO-L (Ethyl Trimethylbenzoyl Phenylphosphinate)
- BAPO (Bis-Trimethylbenzoyl Phenylphosphine Oxide)
- HCPK (Hydroxycyclohexyl Phenyl Ketone)
- TMO (Trimethylbenzoyl Ditolylphosphine Oxide), also known as TPO-R
All of the above substances are fully legal in the EU market, allowing for not only a durable and aesthetic manicure effect but also ensuring safety and comfort during the use of the products.
Can Modena Nails products be considered safe?
We can confidently say yes. The photoinitiator TPO is no longer present in our products. Instead, we have used safe, approved substances that allow for a equally durable and well-cured manicure — while maintaining the highest safety standards.
If you have any doubts, you can always check the composition provided with each product Ingredients (INCI) to see if the cosmetic contains TPO and which photoinitiators have been used. Such information is always visible, as customers have the right to know what they are applying to their nails.
