Nandrolon, also 19-Nortestosterone, is an anabolic steroid. It influences how testosterone the development of male sex organs and protein construction in the muscles. The average man is the ratio in the body of testosterone to Nandrolon 50: 1. Since Nandrolone has a much higher activity as a testosterone and the ratio between virilizing effect and anabolic effect in favor of the metabolic effect is shifted, it is as a doping agent of greater interest. Trenbolon is a descendant of the Nandrolone.