Liu, Jialiu, et al. Effects of gypenosides-containing tonics on the serum SOD activity and MDA content in middle aged persons. Journal of Guiyang Medical College. 1994.

Dr. Liu, the world’s foremost expert on Jiaogulan, gave gypenosides (the active ingredient in Jiaogulan) to 610 healthy patients ages 50 to 90. They received the gypenosides for one month. Those patients between 70 and 90 years of age averaged a decrease in harmful oxidants of 21.4% and an average increase in the internally produced anti-oxidant SOD of 282.8%. Those patients in the age group 50 to 69 had a decrease in harmful oxidants averaging 15.6% and SOD increases of 116.1%. A control group did not experience any change thus suggesting the effects were due to the gypenosides.