Disclosed herein are methods for treating type II diabetes mellitus. In particular, the present invention relates to methods of using an extract ofHedychium coronariumKoenig and a blood glucose reduction agent, to synergistically reduce the blood glucose level of the subject having type II diabetes mellitus.本揭示內容關於一種用以治療第二型糖尿病的方法。具體來說,本揭示內容係關於利用野薑花植物萃取物及降血糖劑協同降低患有第二型糖尿病之個體之血糖值的方法。