Testosterone is the most powerful compound there is, so obviously its perfectly fine to use it by itself. With a long-acting ester like Cypionate doses of 500-1000 mg per week are used with very clear results over a 10 week period. If you’ve ever seen a man swell up with sheer size, then testosterone was the cause of it. But testosterone is nonetheless often stacked. Due to the high occurrence of side-effects, people will usually split up a stack in testosterone and a milder component in order to obtain a less risky cycle, but without having to give up as much of the gains. Primobolan, Equipoise and Deca-Durabolin are the weapons of choice in this matter. Deca seems to be the most popular, probably because of its extremely mild androgenic nature.