Effect of FRB on blood insulin and glucose levels in OGTT and IPITT in experiment 2. Changes of blood glucose [A], AUC of blood glucose [B], change of plasma insulin [C] and AUC of plasma insulin [D] after oral glucose load (2 g/kg). Change of blood glucose [E] and AUC of blood glucose [F] after intraperitoneal insulin load (0.75 U/kg). Ctrl: Control group (), Fen: Fenugreek group (), 0.12% FRB group (), 0.24% FRB group (), 1.2% FRB group (). 1FRB contains 96% of protodioscin converted to dioscin. Values are expressed as mean for 7–8 rats. Asterisks indicate a difference from Ctrl: P < 0.05 (t-test).