Nandrolone Decanoate is a long-acting anabolic-androgenic steroid characterized by its decanoate ester, which provides gradual and sustained release following intramuscular administration. Nandrolone is a synthetic testosterone derivative with distinct anabolic and androgenic properties. It plays a role in regulating protein metabolism and nitrogen balance and has been studied for its effects on muscle tissue, bone metabolism, and collagen synthesis. One of its distinguishing characteristics is its relatively low androgenic activity compared with testosterone, alongside its progestogenic properties. Nandrolone also influences red blood cell production and mineral metabolism. Potential adverse effects include suppression of natural testosterone production, sexual dysfunction, changes in cholesterol levels, fluid retention, elevated hematocrit, and cardiovascular complications.