Gongjindan, commonly called Emperor's Medicine, is regarded as a highly effective medicine in Korea. There are four herbs used in the Gongjindan: musk, cornel, dang-gwi, and antler. It has many recorded health benefits:
 
Sexual hypofunction and infertility
Hepatic hypofunction caused by excessive stress and over drinking
Chronic fatigue and physical decline
Overwork and exhaustion
Blood circulatory disorder and physical depression
Constitutional infirmity
Aging (preventive) and various diseases
Hypersensitivity and somnipathy
Postoperative repair
Hyposexuality, impotence and premature ejaculation
Sexual hypofunction and physical enervation (female)