Testosterone cypionate is a long-acting version of the parent hormone testosterone with an attached cypionate ester to delay its release into the body. Testosterone is the most potent, naturally occurring androgen that is formed in the human body. It is responsible for characteristics specific to males like sexual traits, voice and body hair.
When Testosterone Cypionate is injected, because it is a long acting version of testosterone, it becomes stored in what is known as a depot in the body, and slowly released over a short period of time. Peaking within 1-2 days after injection, the testosterone is then steadily released over the next 12 days and completely tapers out after approximately 3 weeks.