Figure 1: Oral glucose tolerance and insulin response after acute ginsenoside supplementations. Rb1 and Rg1 were orally delivered to rats 12 h and 1 h before oral glucose tolerance test. Low-dose Rb1 (0.01 and 0.1 mg/kg body weight) increased (a), whereas low-dose Rg1 (0.01 mg/kg body weight) decreased (b) glucose levels. This contrasting effect diminished as dose escalated. Insulin responses for Rb1 (c) and Rg1 (d) were not different among groups at all doses. *Significant difference against the Vehicle group, P < 0.05.