I know when I tried andarine that it was working because I got the effect of making me see yellow, especially with headlights at night (was really weird), but I didn't really build much lean mass from it. Yeah I know, it's the least strong SARM, but I figured it would at least do something. They keep coming out with newer, stronger SARMs, and I'd really like to try the newest one--I think it's S23? Haven't heard much about this one.