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Testosterone Cypionate Injection, for intramuscular injection, contains Testosterone Cypionate which is the oil-soluble 17 (beta)- cyclopentylpropionate ester of the androgenic hormone testosterone.Testosterone is also known to increases levels of the growth factor IGF-1 in both the muscle tissue as well as the liver.(2) Testosterone also increases the activity of satellite cells,(3) which are cells that play an active role in repairing exercise-damaged muscle. Testosterone exerts these effects primarily by genomic mechanisms, meaning that it binds to the androgen receptor (AR) thus initiating gene transcription.