Testosterone cypionate

Testosterone cypionate is the oil-soluble 17 (beta)-cyclopentylpropionate ester of the androgenic hormone testosterone. Approximately 7% of testosterone is reduced to 5α-dihydrotestosterone (DHT) by the cytochrome P450 enzyme 5α-reductase, an enzyme highly expressed in male accessory sex organs and hair follicles. Approximately 0.3% of testosterone is converted into estradiol by aromatase (CYP19A1) an enzyme expressed in the brain, liver, and adipose tissues.