Research identifies 485 chemicals in US pesticide products linked to breast cancer, revealing regulatory gaps in how the EPA evaluates pesticide safety. The study, published in Environmental Health Perspectives, highlights that the EPA only reviews individual ingredients rather than complete formulas and neglects thousands of "inert" ingredients that are not biologically harmless. Early-onset breast cancer rates are rising, with exposure to these chemicals widespread in crops, children's lice treatments, lawn fertilizers, and pet products.