I'm not sure why but, I get immense pain everytime I pin...I've been doing everything by the book I believe but, Everytime I pin my glute about 24 hrs later it starts to hurt and by the next day I can barely walk..I even switched it up and pinned my quad to see what happens and same exact pain.It's starting to effect my workouts. Could it be because I'm using Sustanon (sust) 350? Would switching to Sustanon (sust) 250 help? Less mg's per ml? I also thought maybe the gear was dirty so I started a new bottle with same results. I've heard when gear crystalizes in the spot it can be painful. F%@K!!! Help please....