First and foremost, YK-11 helps you grow more muscle in a smaller amount of time. YK-11 is a myostatin inhibitor which makes it easier for your body to develop more muscle. In addition to more bulk, your muscles will become stronger from the production of follistatin. So as you can imagine, the stronger your muscles are the more you can do with them. Like steroids, YK-11 and other SARMs promote bone health and can make your bones stronger.