Oil of oregano contains compounds that can kill bacteria and even fight cancer causing agents.
Carvacrol found in oregano oil has been found to reduce the formation of cancer causing compounds that form when the temperature of beef is raised in the cooking process. It turns out that oregano oil has antioxidant properties can stop the creatine in the beef from reacting with other molecules to potentially cause cancer in those who eat it.
Researchers are also studying oregano oil’s anti-microbial properties to see how it can help fight e-coli outbreaks. Source: http://www.lef.org/news/LefDailyNews.htm?NewsID=10562&Section=Nutrition