4, there was substantial difference in oral pharmacokinetics of ginsenoside Rh2 epimers in rats. Together with the same dosage for oral administration, the Cmax and AUC of 20Rh2 have been 15-fold and 10-fold larger than these of 20-Rh2 respectively: the Cmax of 20-Rh2 was nearly 1000 nM whilst the Cmax of 20-Rh2 was no greater than 50 nM, which suggested superior oral absorption of 20-Rh2 than 20-


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