N,N'-Dimethylthiourea (DMTU), isolated from?Allii Sativi Bulbus, is an orally active scavenger of hydroxyl radical (?OH) and blocks ?OH production by activated neutrophils in vitro. N,N'-Dimethylthiourea protects against water-immersion restraint stress (WIRS)-induced gastric mucosal lesions in rats by exerting its antioxidant action including ?OH scavenging and anti-inflammatory action