Testosterone Cypionate Injection, for intramuscular injection, contains Testosterone Cypionate which is the oil-soluble 17 (beta)-cyclopentylpropionate ester of the androgenic hormone testosterone. The characteristics of testosterone cypionate and testosterone enanthate are very similar, therefore both of them tend to be interchangeable. Its long ester makes it a staple addition to any cycle whether it be cutting or bulking. The increased sense of well-being, increased libido and faster muscle recovery makes it an excellent base for any cycle.