What is nandrolone? Nandrolone Decanoate vs deca durabolin is a synthetic version of the hormone testosterone. It is also known as nandrolone decanoate and 19-nortestosterone. It is a type of anabolic-androgenic steroid. Healthcare professionals prescribe nandrolone to treat certain types of anemia. It can also help regenerate tissue in people with weakened or damaged tissue. Like many other...