Testosterone being the most effective mass builder there is, stacks well with virtually everything and can be used alone for significant increases in both muscle mass and strength. If used in combination with other anabolic-androgenic steroids, items of choice include dianabol, primobolan, equipoise and Deca-Durabolin.
Cypionate can be stacked with compounds other than these ones, but the user should assess his or her goals and decide which steroids and going to bring about what types of gains. For mass, testosterone is excellent choice, and more testosterone should be preferred over stacking with other compounds for that express purpose. To minimize water retention, certain steroids may be preferred and this is a good decision, since more testosterone cannot reduce these water gains (and in fact may only cause them to become worse). This is one example of how stacking cypionate (or any other testosterone) can be very beneficial. However, for the first time user, a recommended cycle is testosterone only, and cypionate is a good choice. Once again, due to its extreme length of action and ability to maintain stable steroid blood levels while minimizing injection frequency.
The testosterone using athlete should be familiar with a variety of ancillary drugs in case estrogen related side effects such as gyno take place. Nolvadex, clomid, and HCG are items which you will likely want to keep on hand, either to use during your cycle, or for post cycle therapy.