Diallyl trisulfide is an organic trisulfide that is trisulfane in which both of the hydrogens are replaced by allyl groups. A component of the essential oil of garlic and a major component of the traditional Chinese medicine allitridium, it exhibits antifungal, antitumour and antioxidant activity. It has a role as an antioxidant, an insecticide, an antineoplastic agent, a vasodilator agent, an antilipemic drug, an antiprotozoal drug, a platelet aggregation inhibitor, an estrogen receptor antagonist, an anti-inflammatory agent and an apoptosis inducer.