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In East-South Asia it has been known that Korean ginseng(Panax ginseng) increases blood pressure, whereas American ginseng(Panax quinquefolius) doesn't. This study was designed to find out if Korean ginseng really could increase blood pressure comparing with American ginseng. Double-blind randomized controlled trials on blood pressure and pulse rate of Korean ginseng and American ginseng in Koreans and Chineses was performed. There was no significant difference on blood pressure and pulse rate between Korean ginseng and American ginseng in both Koreans and Chineses by repeated-measures ANOVA. It was revealed that Korean ginseng does not increase blood pressure. Maybe the concept that Korean ginseng increases blood pressure is concerned with commercial interests dealing with American Ginseng