For years, a quiet assumption has held large parts of the beauty industry together – if your product was on the shelf and nobody had complained, then you were fine.
Enforcement was thin. Inspectors were stretched. Labels got waved through. Plenty of brands built their entire compliance strategy on a single unspoken bet: no one is really checking.
However, the trimethylbenzoyl diphenylphosphine oxide (TPO) ban is where that bet stops paying out.
TPO, to most of us, is a photoinitiator. It is the ingredient that lets gel nail products cure hard and fast under a UV or LED lamp and holds the colour stable. It has sat in gel-polishes, base coats, top coats and builder gels for years.
Now, it is on its way out because it has been classified as a CMR substance (category 1B, toxic to reproduction) under chemicals legislation, triggering its prohibition in cosmetic products.
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Under the cosmetics rules on both sides of the channel a CMR classification is close to a death sentence for an ingredient.
In the European Union (EU) the ban took effect on 1 September 2025. In Great Britain (GB) the timeline is staggered, but no less real.
From 15 August 2026, manufacturers can no longer place TPO-containing products on the GB market.
From 14 February 2027, distributors can no longer make them available for professional purchase.
Northern Ireland, where the EU Cosmetics Regulation continues to apply, has been subject to the EU TPO prohibition since 1 September 2025.
Read those dates again, because the beauty industry keeps misreading them.
The mistakes beauty brands are making right now
The first mistake is treating this as a nail sector-only story. It is not.
It is a formulation and systems story, and the lesson applies to any manufacturer who has ever
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