Etohexadiol (or ethohexadiol) is an ectoparasiticide. It is a liquid aliphatic alcohol, EHD is widely used industrially, commercially and domestically for purposes that include a component of cosmetic formulations, in certain medicinal products, as a solvent, a chelating agent, a reactive diol, an intermediate and formerly an insect repellent. Etohexadiol, also known as Rutgers 612 or "6-12 repellent," discontinued in the US in 1991 due to evidence of causing developmental defects in animals.