I've been taking Deca-Durabolin, Depo-Testosterone, Tetrahydrogestrinone, Winstrol, and Dianabol. I've seen huge mass added, but I'm covered with acne, my nads no longer exist, and I punch people at clubs for no apparent reason.
Just kidding. I've heard NO-Xplode works pretty well for some people. I was taking creatine powder with some other stacker stuff when I was working out. I have a terrible habit of working out real hard for 2 months, then getting sick of it and quitting for 2 months. I don't think anything I ever took made me bigger and stronger, but they sure did help with energy and soreness (which, I guess, in a sense helps you get bigger and stronger). The recovery time you get taking some things are real good and fast.