The Brief

The European Union is banning certain gel nail polish brands that contain TPO, or trimethylbenzoyl diphenylphosphine oxide.

TPO is the chemical compound that makes gel polish harden under UV lights and gives it a glass-like finish.

The EU cited studies that linked TPO to fertility issues.

The European Union has banned a chemical used in many popular gel nail polish brands, citing studies that link it to fertility issues.

Trimethylbenzoyl Diphenylphosphine Oxide (TPO)

Dig deeper:

TPO is a compound that reacts under UV light to make the polish harden quickly and results in a glass-like finish.

The studies that prompted the EU to ban certain gel polishes that contain TPO often focused on animal subjects, not humans. But the EU uses a strict "better safe than sorry" a

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