Lu, G.H., etal. Comparative Study of the anti-hypertensive effects of Gymenosides, ginseng and Indapamide in patients with essential hyperetension. Guizhou Medical Journal. China 1996.

Dr. Lu and his team studied 233 patients with high blood pressure. 1/3 of the patients received and extract from Jiaogulan, 1/3 received a ginseng extract and 1/3 received a popular pharmaceutical drug for high blood pressure. After 3 months they found the pharmaceutical drug was the most effective with a 93% effectiveness rate. Jiaogulan was close behind, 82% effective in controlling the patients high blood pressure. Ginseng was a distant third at 46%.