I've been using Injectable YK-11 for preworkout for the past 3 weeks and it's pretty great. I'm not a SARMS guy by any means but it came highly recommended so i purchased several bottles. Started at 20mg pre-workout, currently up to 40mg and the pumps and vascularity are insane. Strength and reps both increased the session i started using it. Not much on the mental side affects at the 20mg-30mg dose. At the 40mg I may be slightly more easily irritated than usual but nothing too crazy. Will experiment at the 50mg dose here in another week or so.