For me when I ran a cycle of Rad 140 stacked with S4 and GW I got the best strength results to date . I mean compounds like squats and bench was going up either in weights and/or reps consistently . I cannot confirm something like Mk2866 , yk11 as I haven't run these to date . I've ran LGD stacked and I will say it is the best mass sarm out there but for strength personally RAD just really works well with me.