. . "19-Norandrostenedione may be metabolized to 19-nortestosterone in both men and women. 19-Norandrostenedione, also known as nandrolone, is the basic substance of some very popular injectable anabolic steroids, however 19-norandrostenedione is not metabolized to testosterone. Whether or not increases in 19-nortestosterone levels would be sustained long enough by taking 19-norandrostenedione to show an increase in nitrogen retention and muscle strength and mass is unknown. 19-Norandrostenedione has also been shown to bind to androgen receptors with high selectivity. Transactivation of androgen receptor dependent reporter gene expression was 10 times lower than that produced by dihydrotestosterone. [1] "@en . . "734-32-7"@en . "4-estrene-3,17-dione"@en . . . . . "1. Diel, P., et al. \"The prohormone 19-norandrostenedione displays selective androgen receptor modulator (SARM) like properties after subcutaneous administration.\" Toxicology letters 177.3 (2008): 198-204."@en . . "NOR"@en . . . . "Absorption appears variable, but some absorption does occur."@en . "experimental"@en . . . . . . . . . . . "19-norandrostenedione"@en . . "delta4-Estrene-3,17-dione"@en . . . "illicit"@en . . . . " "@en . . . . . "Humans and other mammals"@en . . . . "19-Norandrostenedione refers to two steroid isomers that were once marketed as dietary supplements and mainly used by body builders. After 2005, 19-Norandrostenedione was regulated in the United States as a schedule III controlled substance, as well as banned from use in competitive sports by the World Anti-Doping Agency. In the body 19-norandrostenedione is rapidly metabolized into nandrolone, also known as nortestosterone."@en . . "The claim that supplemental 19-norandrostenedione has anabolic effects is unsubstantiated."@en . . .