As of 1 September 2025, the EU will ban TPO in cosmetic products due to its classification as a reproductive toxicant (CMR Category 1B). TPO is widely used in nail gels as a photoinitiator, but will no longer be permitted unless specifically exempted. Many brands are reformulating, while others are withdrawing from the EU market altogether. Nail technicians must stop using TPO-based products professionally after the ban and ensure traceability of compliant stock. The industry is transitioning toward safer, TPO-free formulations, with clear labelling and increased regulatory awareness.