Research has shown that YK-11 is known to be the most powerful SARM and is more anabolic and androgenic than some steroids without the negative side effects. YK-11 like other SARMs binds to the androgen receptor in muscles and produces drastic increases in muscle. The chemical also inhibits follistatin which in turn inhibits myostatin which is a protein that limits the growth of muscular tissues therefore while present the chemical can actually alter genetic potential to build muscle tissue. Because of selectivity of YK-11 it shows strong anabolic effects in building muscle at a rapid speed but also it doesn’t act on androgen receptors on other parts of the body thus producing no side effects on estrogen or on the liver. Summing everything up YK-11 is great for those building lean muscle mass and gives muscle building potential that otherwise would be genetically limited.
((17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester