YK-11 although lumped into the SARM category is actually a myostatin inhibitor. Myostatin inhibits muscle growth. By inhibiting the inhibitor, YK-11 promotes rapid muscle growth. YK-11 has been shown to be more anabolic than dihydrotestosterone (DHT).
Although just discovered in 2011, YK-11 is quickly developing a reputation as the most powerful SARM.
LGD-4033, also known Ligandrol, is a SARM that has been shown to have positive effects on muscle building, body recomposition, sex drive, and bone density. Already in human trials, Ligandrol has been shown to be highly selective for muscle and bone cells, largely ignoring prostate or sebaceous cells. This makes the side effects for LGD-4033 minimal.
Florida Gators quarterback Will Grier allegedly used Ligandrol to add 43 pounds of muscle in one year.
MK-677, also known as Ibutamoren or Nutrobal, is commonly referred to as a SARM, a selective androgen receptor modulator, but it is actually a Human Growth Hormone secretagogue, meaning that it stimulates the pitutary gland to secrete HGH.
MK-677 has been shown to increase fat-free mass; enhance sleep quality; improve healing of muscle, bone and ligaments; lower LDL cholesterol; improve hair and skin appearance; and improve overall sense of well-being.
MK-677 does not cause pituitary sensitization, nor does it suppress the body’s production of Growth Hormone.
Because Ibutamoren doesn’t stimulate testosterone, there are no chances of aromatization, or danger to liver, kidney, or prostate