Lagerstroemia speciosa leave (Lagerstroemiaspeciosa (L.) is the  Lythraceae plant. The leaves contain the plant acid called Corosolic Afid, which is a natural triterpenoid. Latest clinical study confirmed, Corosolic Acid effectively maintains the blood glucose levels to prevent sugar and starch absorption, prevent fat formation or accumulation by changing blood glucose carrier activity .At present, this natural products have been listed in the U.S. as nutritional supplements, and treatment of diabetes Ⅲ clinical trials, it may be adopted by the FDA soon. Lagerstroemia speciosa leaf preparations have a significant effect of oral administration, toxicity, and easy use. In addition, Corosolic Afid is a natural powerful antioxidant, can remove the free radicals of body, have the inhibitory effect on cancer.

Diabetic tea takes the lagerstroemia speciosa leaves as the main raw material, with addition of significant hypoglycemic effect paliurus, sweet tea and other natural plants, using modern technology to process the tea leaves.