不是中藥，是植物藥，單一的源於歐洲的Sweet Clover，與中醫沒有關係

Sweet clover (Melilotus officinalis) is a plant native to Europe and now found throughout the world. Its flowering branch and leaf are used as medicine.

Sweet clover contains ingredients that might thin the blood and help wounds heal.

People use sweet clover for varicose veins, poor blood circulation, nerve pain in people with diabetes, bruises, and many other conditions, but there is no good scientific evidence to support these uses.

Don't confuse sweet clover with red clover. These are not the same.

以上來自WebMD 網頁。

美國市場上有賣這種植物的粉末作為營養補充劑，日本的藥是浸液。