TESTOSTERONE C 300 – is an ester of male growth hormone that is responsible for the development of men sexual organs and secondary sex qualities, men hair syndication, muscle groups and the. Testosteron Cypionate is used as hormone replacement therapy in disorders caused by testosterone deficiency. It is one of the most popular steroids for muscle mass growth with a long-term action. It provides anabolic and androgenic effects. Testosteron Cypionate stimulates the regenerative processes in the body.