Celery is rich in both sodium and potassium, and both of these minerals help to regulate the fluid balance in the body. Potassium also acts as a vasodilator, reducing blood pressure. A few animal studies suggest that celery seed extracts may help lower blood pressure and cholesterol, as well as protect the liver from damaging substances such as high doses of the pain reliever acetaminophen (Tylenol). But again, researchers dont know whether that would be true in people.
Source: Celery seed | University of Maryland Medical Center http://umm.edu/health/medical/altmed/herb/celeryseed#ixzz3FCLQhZUq
University of Maryland Medical Center
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