Deca Durabolin is officially classified as a 19-nortestosterone (19-nor) anabolic androgenic steroid. The 19-nor classification refers to its direct structural nature, which is the testosterone hormone lacking a carbon atom at the 19th position. While this is only a slight change in structure from the testosterone hormone, this slight change gives us a unique anabolic steroid. As a Nandrolone base, Deca Durabolin is attached to the large Decanoate ester, which controls the hormone’s releasing activity slowing it down tremendously. This allows the individual to make use of the Nandrolone hormone without the need for frequent injections. Once injected, as the Decanoate ester begins to detach there will be a sharp spike in Nandrolone released within the body during the first 24-48 hours. From this point, the hormone will continue to release into the body for approximately 2-3 weeks.