The Big Story Why is Canada so slow to ban dyes and chemicals that are considered dangerous around the world?
Oct 1, 2025
Miriam Diamond, a University of Toronto professor specializing in environmental health, dives into the controversy surrounding TPO, the chemical found in gel nail polishes. She explains its potential reproductive risks highlighted by the EU's recent ban. The conversation shifts to Canada's contrasting risk-based regulation and the lack of proactive measures. Miriam discusses concerns for salon workers, the effectiveness of safety gear, and the influence of industry lobbying. She advocates for a more precautionary approach to chemical safety in Canada.
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TPO Is A Hazard That Hardens Under UV
- TPO is a high-production chemical used in gel nail polishes and industrial adhesives that harden under UV light.
- The EU banned TPO as a reproductive toxicant after animal studies showed fetal malformations, while Canada focuses on exposure levels before restricting it.
Canada Uses Risk, Not Just Hazard
- Risk depends on both hazard and exposure, and Canada assesses whether exposure is high enough to cause harm.
- Canada has so far judged typical consumer exposure to TPO during manicures as unlikely to cause fetal harm, but worker exposures remain uncertain.
Protect Workers, Not Just Consumers
- Be mindful of nail salon workers and chemical manufacturers who face greater exposure to TPO than occasional customers.
- Consider supporting protective measures or alternatives that reduce occupational exposure to hazardous ingredients.
