Table 1. Biological activities of individual herbs in the DGLHD.

		Islet β cell protection	Hypoglycemic	Hypolipidemic	Insulin sensitivity	Diabetic complications
	DGLHD	+	+	+	+	+
Principal components	Angelica sinensis		+	+
	Radix rehmanniae		+			+
	Radix rehmanniae preparata		+			+
Adjuvant components	Radix scutellariae			+		+
	Rhizoma coptidis		+	+	+
	Cortex phellodendri		+	+	+
	Radix astragali	+	+			+