Is it possible to control high blood pressure levels without medication?

http://health.usnews.com/doctors/chauncey-crandall-21514

It is possible to control high blood pressure levels without medicines, says Dr. Chauncey Crandall. According to him, by taking 300 to 500 mg magnesium regularly helps in lowering high blood pressure levels. Apart from this, exercising, sound sleep and reduced stress also help in bringing down blood pressure levels.