A new regulation banning the ingredient Trimethylbenzoyl diphenylphosphine oxide (TPO) in nail products is coming into force in the UK. TPO is a chemical photoinitiator used in some gel nail polishes to cure nails under UV/LED light. Following toxicity and health concerns, it has been banned in the EU since September 2025.
Ban Timeline
Starting August 15, 2026, manufacturers and importers are no longer permitted to introduce new batches of TPO-containing products to the British market. This will be followed by a prohibition on retailers and distributors selling or supplying TPO-containing products to technicians or the public as of September 14, 2027.
Why Is TPO Being Banned?
The ban follows the reclassification of TPO as a Category 1B Reproductive Toxicant (CMR). Research showed that when rats consumed high concentrations of TPO, it resulted in harmful effects on fertility and reproductive development. Under the UK Cosmetics Regulation Act, any chemical designated as a Category 1A or 1B CMR is automatically prohibited from cosmetic products. Additionally, studies found that repeated use of TPO-related products can cause skin allergies due to its powerful skin-sensitising properties.
Impact on Nail Appointments
Experts advise that cancelling upcoming nail appointments is unnecessary, as many UK salons use trusted brands that keep up with regulations. It is expected that salons will switch to upgraded product formulations, and clients will still find the same colours, finishes, and treatment options. Professional nail technicians should be able to answer questions about the products they use. Those with a history of allergies or reactions to beauty products are advised to inform their technicians.
