When 4-vinylcyclohexene (VCHE) and 4-vinylcyclohexene monoxide (VCM) were administered to mice at 500 mg/kg, cytochrome P-450, cytochrome b5, NADPH-cytochrome c reductase and aminopyrine-N-demethylase and epoxide hydrolase were induced. Doses of 500 mg/kg of VCHE, VCM and 4-vinylcyclohexene diepoxide depleted rapidly hepatic reduced glutathione levels suggesting that glutathione is probably involved in the metabolism of VCHE.