Unlike many anabolics, Test-600x has no side effects. However, if you take the illegal version of this supplement, you may suffer from a battery of side effects. Unlike many anabolics, the illegal form of this supplement is not toxic to the liver or kidneys. However, it still can cause some serious side effects. One of these is gynecomastia, which is the development of secondary female characteristics, especially breast tissue. This happens in illegal forms of this supplement because pure injected testosterone can be converted to estrogen by the body. Gynecomastia is often very embarrassing, and you can avoid it by taking Test-600x instead of its illegal counterparts.