OEHHA adds N‑methyl‑N‑formylhydrazine to Proposition 65 list as a carcinogen (effective Dec 8, 2025)

OEHHA added N‑methyl‑N‑formylhydrazine to the Proposition 65 list as a chemical known to cause cancer. Businesses selling products in California should evaluate whether the chemical is present in products or workplace/consumer exposure scenarios and determine if Prop 65 warning, reformulation, or exposure mitigation actions are needed based on anticipated exposure pathways.