Cilantro is known to be rich in phytonutrients, flavonoids and active phenolic acid compounds, all of which are good for you. There are no definitive studies on cilantro but many believe that it and the seeds (often called coriander), have been found to help control blood sugar, lower cholesterol and fight inflammation and free radicals. There is further speculations that cilantro may also have antimicrobial properties.
As an antioxidant cilantro is able to help reduce inflammation. In this capacity it fights free radicals that destroy cellular structure.
It is also believed that cilantro may be an effective chellation therapy for people who have excess mercury in their systems.