It was discovered by Yuichiro Kanno, a Japanese researcher in 2011 and he called it a potential anabolic SARM. YK-11 is a steroidal SARM, which means it is closer to being a steroid rather than a SARM.Apart from its purported benefits in helping improve lean muscle mass, YK-11 also helps to inhibit the action of DHT at specific sites in the body which might one day prove to be beneficial for treating hair loss. It is also proven to improve the upregulation of follistatin, a myostatin antagonist. By stopping the action of myostatin, YK-11 should definitely help increase lean muscle mass.