Atrazine is a weed-killer herbicide and is the most common chemical contaminant of ground and surface water in the United States. It is a potent endocrine hormone disruptor with ill effects in wildlife, laboratory animals and humans. Atrazine chemically castrates and feminizes wildlife. Researcher Tyrone Hayes discovered how the chemical makes male frogs turn female and should not be consumed by humans for this reason as it disrupts human hormones. The feminization of animals and humans is something to consider when buying organic at the grocery store. Avoiding Atrazine should be a priority.