Oregano is a powerful antioxidant derived from the oregano herb. Oil of Oregano has been used traditionally for a wide range of ailments, including colds and flus, indigestion, dental cavities, respiratory disorders, rheumatoid arthritis and urinary tract infections. It is currently being studied for its antimicrobial properties ranging from antiviral, antibacterial to antiparasitic. Oregano oil naturally contains a constituent called carvacrol and research has shown that it gives Oil of Oregano its potent antimicrobial and antioxidant characteristic.